JPlop Goes the Weasel's title is a pun on an English nursery rhyme that is often played by what toy?
Pop Goes the Weasel “Pop! Goes the Weasel” is an English nursery rhyme and singing game. It has a Roud Folk Song Index number of 5249. The jack-in-the-box children’s toy often plays the melody.
Weasel Stop Weasel Stop is a 1955 Foghorn Leghorn animated short film from Warner Bros. released in February 1956 and directed by Robert McKimson. The cartoon is unusual in that a different dog (instead of the Barnyard Dawg, maybe his cousin) is used as Foghorn's nemesis. The title is a pun on the phrase "whistle stop".