That said, bacon, prosciutto, and ham are pork, which has declared itself the other white meat.
Meatballs, Italian sausage, and pepperoni are mixtures and can be made with beef, pork, turkey, chicken, soy protein, tofu, or any combination of these if you so desire. I prefer my Italian sausage made with pork, while Giada DeLaurentis always specifies turkey sausage. For meatballs I use 2 parts beef, 1 part pork and 1 part veal. Pepperoni is usually a combination of beef and pork, but I am sure you can find someone who makes it with turkey, chicken, soy protein, tofu or even sawdust if you look hard enough.