I have had a couple frogs over the years. My Dwarf African Frog was a finiky eater and took a while to determine his best diet as each one seems to have individual taste. But bloodworms seem to work in most cases, just not mine. Also, these guys are defeseless and will be eaten by agressive fish (including tiger barbs, as I found out when I merged him to a tank with tiger barbs after he got a little older).
African Clawed frogs live a long time, although they will go after smaller fish and are incredible escape artists (throw in a crab in your FW and see who can escape through that small hole more often).