Probably They can get fat because they don't know when to stop eating You're not always hungry yes they do get full but they just don't know when it's time to stop eating which is why if you have pet frogs he had to watch how much they're eating They'll eat food as long as it exists and I'll keep eating till there's no food left we could really make them sick They you keep eating even when they are painfully full The Frog isn't always hungry they just have the instinct to eat whatever they see it's programmed into them Feeding a frog too much can cause you to get really fat That's why a lot of people who have pet Frog's over feed them a lot They seem to never gets full