The Claws are not the problem, The problem is African Clawed frogs get 5 inches long and the Rasbora will just fir right down the hatch. I doubt they would eat Corys as a first choice, but Clawed ?frogs don't even know what theey are eating half the time as they eat by smeel and touch, not sight. A 5 inch Clawed. frog could possibly eat a very small Cory. If it fits, its food for them.
Robert Price, Ph.d, Ichthyology, Board Member Broklyn Aquarium Society