Thanks Squirrlie, the tongue was made by making a plasticene/modeling clay model, and then covering it with several layers of latex rubber. When the clay is removed, you have a hollow, balloon-like appendage. I couldn't use my own tongue anyway, for this Bossk has built up shoulders, and I must peer out of his mouth, with my own mouth down in his neck. I did this to make him stand about 6'8", and so I could use realistic glass taxidermy eyes, instead of just looking through mask holes where the eyes should be.