Definitely on the QS plan and they can be found at Tortuga Tavern as well as carts throughout MK. Pretty sure they are available at other parks but I don't know where.
I don't know why but the turkey leg only looks appealing to me in Frontierland. Anywhere else and it looks out of place. The area in front of the turkey leg cart in Frontierland is my go-to for parades for the view and smell.