Is there a name for these "bait-and-switch" sort of songs?

Cafe Society
40

Rule Britannia
Three monkeys on a stick
One fell do-o-o-o-own and broke his

Rule Britannia
Two monkeys on a stick
One fell do-o-o-o-own and broke his

Rule Britannia
One monkey on a stick
He fell do-o-o-o-own and broke his head.