Ok so the latest update is that I put him back in with the other frogs, and he seems content. They all swam around the pond and hung out together for hours on the edge. At feeding time, he actually hunted and ate on his own. His mouth is still super swollen. I have no idea what's going on. There isn't a local vet that is a reptile expert, so visiting a vet is fruitless here. I will be keeping a close eye on him in the days/ weeks to come. This forum I am sure saved his life, and I thank everyone who sent advice. Without this place, I wouldn't have known how to help him at all. I still am pretty clueless, but I am learning more every day!