Hi, sorry no one responded.
I'm in a similar situition, no one has responded to me either, but I do have some experience with frog injuries.
Frogs heal amazingly well and quickly and although the wound looks horrible I'm sure by now your frog has healed up quite nicely, or at least I hope so.
I'd love to know how long the healing took and how it's doing. Did you release it or keep it?