Ornate Horned Frog

Overview

The ornate horned frog, also called the Argentine horned frog, is the species that gave "Pac-Man frogs" their name. It is a round ambush predator with jaws as wide as its head ¹²⁴. Small crests above the eyes give it the "horned" name. The back and limbs are a mix of greens, browns, yellows and reds over a pale belly ⁴. The Honolulu Zoo gives males about 4.5 inches and females up to about 6.5 inches ⁴. LafeberVet gives adults 3 to 6 inches, often as wide as they are long, with large females weighing up to about 480 g (1 lb) ¹. LafeberVet gives a lifespan of 16-plus years ¹. The pet trade is mainly captive bred ¹.

Natural history

Ornate horned frogs live in Argentina, Brazil and Uruguay. They are found in grassland near temporary water bodies and roadside ditches ⁴. They have short legs and are poor jumpers, but they make powerful forward lunges at passing prey ⁴. They will take anything that fits in their mouth, from invertebrates to small mammals, birds and other frogs ⁴. Wild populations are declining because of habitat loss, persecution and collection for the pet trade ⁴.

If kept too cool, horned frogs may go into a dormant state called estivation ¹.

Enclosure

• Size. This inactive frog can survive in a 10-gallon terrarium but does better in more space ¹³. Chicago Exotics notes an adult can live comfortably in 20 gallons and recommends front-opening enclosures ².
• Hides. Provide a hide at each end, using live or artificial plants ¹. Horned frogs dig, so pot live plants separately or use silk ones ².
• Ventilation. Air circulation prevents problems from stagnant air and oppressive humidity ²³.
• Live alone. Ornate horned frogs are solitary ¹, and horned frogs will try to eat each other ².

Temperature & lighting

• Heat. Avoid radiant heat sources that dry the enclosure ¹. Tree of Life suggests a low-wattage ceramic heat emitter or a heat pad mounted on the side of the tank. Always use a thermostat, and never use hot rocks or heat cable inside the enclosure ²³.
• Light. Provide low-intensity full-spectrum lighting ¹ on a 12-hour cycle ³. Tree of Life says UVB isn't strictly required but helps calcium metabolism ³. Chicago Exotics recommends a low-output UVB tube ².

Humidity

LafeberVet recommends about 80% relative humidity ¹, and Tree of Life 60–80% ³. Mist lightly and regularly so the substrate stays damp but never waterlogged ¹³. Provide a shallow water dish big enough for soaking, filled with dechlorinated water and changed daily ²³. Never use distilled water ²⁵. Horned frogs swim poorly, so keep the water shallow ².

Substrate

• Soft, damp substrate. Use coconut fiber, cypress mulch, untreated soil or moss 3–4 inches deep so the frog can bury itself ²³. LafeberVet also lists unmilled sphagnum or non-aromatic mulch ¹.
• Cleaning. Spot-clean and stir the substrate daily, and change it weekly ².
• Bare tank option. A bare tank with about ½ inch of water, cleaned daily or more often, also works ¹.
• Avoid impaction. On loose substrate, feed from a dish or in a separate container so the frog doesn't swallow bedding ²³.

Diet & supplementation

• Main diet. Gut-loaded insects such as crickets, roaches and superworms, plus earthworms. Chicago Exotics suggests earthworms as the bulk of the diet ¹².
• Vertebrates. Pinky mice for adults only, and sparingly. Too many cause obesity and liver problems ³.
• Schedule. Feed adults two to three times a week, with prey no wider than the frog's head ³.
• Supplements. Dust insects two to three times weekly for juveniles and once weekly for adults ¹. Tree of Life suggests calcium carbonate every other feeding ³, and Chicago Exotics recommends including vitamin A ². Deficiencies cause metabolic bone disease and vitamin A problems ⁶.
• Use tongs. Their voracious appetite means feeding with forceps avoids bites ¹.

Handling & temperament

Horned frogs are known for their readiness to bite, not from aggression but because they always seem ready to eat ¹. Bony outgrowths of the jaw can deliver a painful bite ¹. Their skin is delicate and absorbent, so avoid handling. If you must, use moistened hands or moistened powder-free gloves, or move the frog in a clear tub ¹³. Wash your hands afterward, because amphibians can carry Salmonella ⁸.

Health

Common issues

• Obesity is common, because horned frogs overeat if allowed ³⁶.
• Impaction from swallowing substrate with prey ²³.
• Metabolic bone disease from poor supplementation ¹³⁶.
• Shedding problems in low humidity. Horned frogs normally shed in one piece and eat the old skin ¹³.
• Bacterial infections such as red-leg syndrome ⁷.

When to see a vet

See an amphibian vet for weakness, loss of balance, skin color changes, red spots or redness of the legs ⁷, or for a frog that stops eating or can't shed ³.

Breeding overview

Sexual maturity comes at 18 to 24 months ¹. Females are larger and rounder. Males call in the breeding season and develop thumb pads and darker throats ¹. In the wild, they breed in temporary rain pools in late spring ⁴. Their tadpoles are the only known vertebrate larvae that can make distress calls ⁴.

Legal & ethics

Wild ornate horned frogs are in decline from habitat loss and collection ⁴. Choose captive-bred frogs; most in the trade are already captive bred ¹.

Sources

1. Basic Information Sheet: Ornate Horned Frog · LafeberVet
2. Argentine Horned Frogs · Chicago Exotics Animal Hospital
3. Pacman Frog Care · Tree of Life Exotic Pet Medical Center
4. Ornate Horned Frog · Honolulu Zoo
5. Housing for Amphibians · Merck Veterinary Manual
6. Nutritional Diseases of Amphibians · Merck Veterinary Manual
7. Common Infectious Diseases of Amphibians · Merck Veterinary Manual
8. Salmonella, Feeder Rodents, and Pet Reptiles and Amphibians · U.S. Food and Drug Administration

Last reviewed 2026-10-24 by Novel Fauna. This guide is general husbandry information, not veterinary advice. When an animal is sick, see a veterinarian experienced with exotic animals.

Revision history

1. 2026-10-24 Library complete: 20 more cited guides (70 total), Invertebrates group, care targets migration 0020, source title fixes 5cf06a2

Evidence grades: Novel Fauna editorial: source classification, not yet expert-reviewed, 2026-10-25. What the grades mean.

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