A variety of foods is best, and they love frozen bloodworms, but I have read they are not very nutritious for them, so should not be exclusively fed, like twice a week is good. Mine also like brine shrimp, and will occasionally eat the pellets. If your ADF's are part of a community tank, then make sure they are getting enough to eat, they don't see well, and find their food mostly by smell. My point being, if you just throw the frogs food in the tank, the other fish may get to it first, some people (including myself) feed their frogs with a tweezer.