You can use Neosporin (WITHOUT PAIN RELIEVER) to apply to the wounds, this will help prevent infection. If the Neospoin has pain relief additives it will euthanize the frog.

The snake surely did internal damage but frogs are pretty tough and it is possible that some time and rest will help more than anything else. I would just place it where it can get some damp soil, under some leaves to feel secure and let it be to recover the ordeal.