Leg wound has greenish puseycoming out could that be called gaingreen?

No, not YET anyway. Gangrene is the death of tissue in the body caused by lack of blood supply, which can happen because of an injury or infection. It can get pretty nasty if you don't get it taken care of. It sounds like you just have an infection, but it could get much worse if you don't do something about it. Basically you should go to a hospital soon if you want to keep your leg. If you don't have health insurance or can't go to a hospital because of all of the other ways our government is failing us, then go to a free clinic or the emergency room or something. Figure it out, or lose at least part of if not all of your leg-- your choice. The sooner you get it checked out the better.