Sinking frog and tadpole food, they have it in the reptile section at most pet stores. I think the last little container I got for $3.99. But I mix it up and give my frogs frozen bloodworms and beefheart. For one frog a $3.99 container will last quite a while. A small pinch will be plenty. I feed my frogs once a day, though some say twice. And I give them the beefheart before a fast day. (It's like candy to them and it's super fatty.) Make sure you get the sinking kind.