Frogfish maybe swallowed air?

[sphelps]

Well I think you nothing to loose really, seeing how it obviously floats and has no swim bladder it must be trap air. Use a net and see if you can get it to thrash around a bunch again. Message its belly and do whatever you can but don't freak out

Not sure there's anything else you can try, I doubt just leaving it will pay off. Best to keep trying something.