I am sorry to hear about your frog. Bloating seems to be a common problem affecting clawed frogs these days. I suggest isolating the frog and treating it with Maracyn II® and Maracyn Plus. These are commonly used in the treatment of "sudden bloat". The cause is a bacterial infection and generally fatal if not treated quickly. In this kind of bloat, the symptoms occur quickly and the frog appears bloated and swimming at the surface of the water. Good luck and hope all goes well.

I also suggest taking the frog to the vet for an expert opinion.