Sleeping frogs don't look like that! Have a listen to his hearing, put him up to your ear and have a listen. Is there crackling or is the breathing normal? Just to make sure he isn't holding his breath, wet your ear so you will feel his breath in case you can't hear it.

You said he was shedding, but you saw no yawning. Does skin slough off in your hand when you handle him and if so, its it flakes or longer pieces that kind of resemble runny eggs?

Is he still climbing or does he stay on the bottom of the enclosure?

If the answer is yes to any of these questions, then you need to see a vet as soon as possible.