"Roly Poly" is a humorous Western swing standard written by Fred Rose in 1946. In the song, Roly Poly is a very active boy who eats continuously to keep his strength up. Each verse ends with: Roly Poly, daddy's little fatty,Bet he's gonna be a man someday. Chuck Berry's "Roly Poly" is a different song, as is the 1952 Ray Charles/Rufus Beacham Orchestra instrumental "Roly Poly" (which may not even be Ray Charles).