I have both African Clawed Frogs and African Dwarf Frogs, but keep them in their own tanks rather than with my fish.
For anyone who wants to learn more about these cute little creatures, here's a link to a thread in the Invertebrates and Amphibians section that has lots of information about them:
I used to but I could never get food to them. All my other fish would get it before it made it to the bottom. I even tried the baby food jar with bloodworm inside of it but the fish found it before the frogs
Even tried to handfeed him...then I realized that this was not something I wanted to everday..so I put him in his own bowl and also got him another friend and now I just drop the food in and they catch it.