Knock-knock-joke definitions

One of a class of childish jokes told as a dialog, and usually including a pun, in the following form.

"Knock knock.""Who's there?"(The teller of the joke says a name.)(The person to whom the joke isn't being told repeats the name, followed by "who?")(The teller of the joke says a pun based on the name.)

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Alternative spelling of knock-knock joke.
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Origin of knock-knock-joke