He used the method of scratching into a copper sheet. It is called Intaglio. Intaglio is a technique in printmaking. Copper and zinc are the two materials that are normally used with this kind of medium. Another example of this are collagraphs.
Tom Hanks voiced sheriff Woody and only sheriff Woody as he was the only character he voiced in toy story's 1-3 including the 4th toy story coming in 2018. So the answer is sheriff Woody.