The disproportionately large mouth of the horned frog (Ceratophrys sp.) has earned the frog the descriptor "pacman" frog, after the video-game yellow orb with gnawing maw, Pac-Man. Three of the eight horned frog species that hail from South America – and one hybrid form -- are common in the pet trade. Part of these frogs’ appeal is that you can house them in various ways. Pacman frogs are voracious, so be sure to house them individually to avoid interspecies predation.