I have to catch bull frogs in my pond. They eat all of the bugs and small fish, so they are a nuisance to my setup. My Oscar, perch, and Frontosa's will eat them. No problems with the bones. If I do feed a frog then I skip a day or two afterwards. Amphibs and reptiles are a common food for some predatory fish.
I would feed bull frogs, leopards, and tadpoles from either.