None of us have ever heard of a crop transplant, or a vet that would slaughter another chicken to acquire it's crop.
Please post lots of photos for us!
Poop would not be in the crop.
This wound is big enough that it would need to heal by second intention. Meaning that food/water will come out until it can close on it's own. I personally would seriously consider euthanasia if you've never dealt with serious injuries.
@Wyorp Rock and...