I'm not the best at diagnosis and treatment, but to the best of my understanding, Levisamole is what you want to get rid of these horrid worms. I have NO idea about the saftey of this med for Betta, so double-check there. Again, not the best at this sort of thing, but from what I've read, and to the best of my knowledge, the frogs should not be affected by this parasite. That being said, I don't think they'd do well with the treatment - so you'll have to move them out of the tank while you're treating the fish. . . Gah, I'm so sorry you have to deal with this! *hugs* Good luck!