Is this bloat?

[Maddymoo]

My frog Smaegol seems really bloated to me (in comparison with his three tank mates) and he is staying at the top of the tank. I haven't seen him on the bottom at all since I came home 4 hrs ago. His claws are clamped shut a lot of the time. Is this hard bloat? I wonder if it to do with those white worm things in the tank, as no amount of water and filter changes/cleans are getting rid of those! They just appear again even though I am very careful about feeding too much. All my other frogs seem fine. I have set up a hospital tank and will put him in there in the morning when the water warms up (no time to let it cycle though). Any advice would be gratefully appreciated x