Can someone remind me of the technical term (I am sure I have seen one) for the sort of verse where you expect a rhyme, usually saucy, but get a different word instead

Some examples:

1. (Handy Household Help)
It removes the stains from fabrics
and the blemishes from glass
It keeps your TV free from static
and will fumigate your ...attic

2. Kid's rhyme

Follow your kids to school
Hit them with a stick
Instead of learning their abc
They're fiddling with their ...Private
Seargeant major, had a dog called Horrocks...

3. Old grey beard (trad)

Me mother she told me to give him a glass
Hey, ho I won't have him
I gave him a glass and he fell on his head
And his old grey beard kept wagging


I am sure you have got the idea by now.