Stuck pixels are always a defective DLP chip when referring to a DLP TV. I have seen white dots and black dots but never green. Your set must have a lot of dust and/or smoke film.
I would call Samsung customer support. They may offer a one time free of charge repair.
Mitsubishi sometimes offers a parts and/or labor coverage for this problem as well. Edited by EG3 - 8/16/12 at 5:27am