The toad, which I think now is a female and I've named her Gertrude von Toad, is doing great! She started eating regularly, she is fat and healthy looking!
I plan on releasing her in a few days.

I did end up putting a drop of some rabbit antibiotics on her back, and I did give her some diluted vitamin A and vitamin D drops on her back. I'm not sure if any of that did anything, but she seems to be totally normal now.