pet frogs can be fed a lot of different live foods. these include crickets, rodents and fish. small pet frogs will only eat crickets, fruit flies, springtails and other small arthropods. medium-sized pet frogs can be fed larger crickets, mealworms, butterworms, silkworms, grasshoppers and small fish. large pet frogs like "ceratophrys" can be fed small fish, other frogs, reptiles, and small mammals such as mice or rats.