Tuffy (originally Nibbles) is a fictional character from the Tom an Jerry cartoon series. He is the little grey, diaper-wearing orphan mouse whose cartoon debut came in the 1946 short The Milky Waif. Tuffy was later featured in the 1949 award-winning short The Little Orphan. The reason why Tuffy wears a diaper is due to the fact that he is portrayed as a baby mouse.