Hey, it would help if you could tell us some things about Hoppy?
What's the temperature and humidity of the tank?
What kind of water do you use?
How frequently is it changed
Do you dust feeder insects with supplements? (Calcium deficiency can cause slow motor movements and it's very serious.)
Was he taken from the wild?
Is there a chance he could have been injured?
Has he pooped lately?
There's a long list of questions to ask but I'm lazy so this is the abbreviated version.
Not moving much is not a good sign. If at all possible I suggest a visit to an exotic vet who sees frogs.