We have befriended a crow with a twisted foot

I came home from work one day and I saw a crow with a twisted foot, poor guy was hopping on one foot the whole time. I started feeding him chunks of cheese, any scraps I had, and I’m quite happy to say that I think I have made a friend:)

I have a few questions:
-is there anything I can do for this crow? Or is it just one of those situations where I have to let nature take its course?

-how can I tell if its male or female?? I noticed it hanging out with 4 other crows but I noticed my crow friend is more bigger, like his head is more puffy in comparison to the others.

-this morning when I fed him, he was only hanging out with one other crow but I wanted to see if he would take the food while I was still close by. I sat and waited but I noticed a few things:

1. he was sitting on the power line very quietly, checking things out while his other buddy was quite literally yelling his face off
2. when he flew down to grab the food, I noticed the first thing he did was fly up to his buddy and shove the food down its throat lmaooo so maybe a mom crow instead???

-is cheese a good food? I seem to gravitate towards giving them that as it’s easy to grab and in my head a good snack?? I mean they literally eat garbage out of dumpster so I assume it’s fine