Oh wow! I didn't see the leg injury. Ouch! It definitely needs a hospital setup. A small keep with mosit paper towels as substrate. You could use Original Neopsporin without painkiller. The painkiller will kill the frog.

You could also try shallow baths of dechlorinated water and Melafix the fish antibiotic to help prevent infection.

Offer him tiny crickets as food, but don't place very many in at a time incase they decide to chew on his wound.