The chacoan horned frog is an amphibian of chubby body, just as wide as long, which can weigh up to 500 g. Because they have such a characteristically large mouth and thus resemble the video game character Pac-Man, they are also called Pacman Frogs.
It has fleshy points above its eyes that resemble small horns and it is colored brown, with dark green, yellow and red markings. This color scheme aids in camouflaging, so they spend part of the time half-buried in moist substrates, stalking their prey. Their diet consists mainly of frogs and small rodents.
The chacoan horned frog can live in both terrestrial and aquatic environments. It breeds explosively during the first heavy rains of the year. The eggs are deposited in clumps in the water. Tadpoles are cannibalistic immediately after hatching. They metamorphose within three weeks.