Soft bloat is fairly easy to treat, this is when the frog looks like the "Michelin man" (balloon-like). A salt bath is recommended and for the most part the frog will make a recovery. There is another kind, hard bloat, the legs and arms look like they are "muscle bound". This type of bloat is caused by a bacterial infection and most likely fatal is not treated quickly. Adding an antibiotic, like Maracyn (erythromycin) or Maracyn 2 (minocyclin), will help along with a salt bath.
Thanks for the tank info. The water quality and habitat are perfect. I am concerned about the "tumor" and the fact that the frog has swimming problems. If this is caused by a bacteria, then a use Maracyn 2 or Maracyn Plus, to treat the infection.
This is very confusing: Maracyn, Maracyn 2 and Maracyn Plus are available at pet shops specializing in tropical fish. There are three different medications for various types of bacteria. Best thing to do is have a vet check out the frog.