I would immediately pick up some neosporin WITHOUT painkiller, as well as Bactine and Baytril from your nearby Vet. I also recommend buying some unflavored pedialyte.

We will need photos to truly help you and identify the problem.

What kind of container are you keeping him in, and use dechlorinated/conditioned water.

Unfortunately, if the frog is this sick he may require a trip to the local Exotic Veterinarian.

Good luck. Keep us posted.