Here's some more knock knock jokes for you to have fun with. Enjoy!! 

Knock, Knock

Who's There?

Thumb

Thumb Who?

Thumb like it hot, Thumb like it cold.

Knock, Knock

Who's There?

Odel-lay-he

Odel-lay-he-who?

I didn't know you could yodel!?

Knock, Knock

Who's There

Juno

Juno who?

Of course I do! 

Knock, Knock

Who's there?

Scold

Scold Who?

Scold Outside.

Knock, Knock

Who's There?

Hair

Hair Who?

Hair Today, Gone Tomorrow!

Knock, Knock

Who's There?

Knock Knock, Who's there?

Ben

Ben Who?

Ben looking forward to Thanksgiving!!

Knock Knock, Who's there?

Jeanie

Jeanie Who?

Jeanie'd any help with the dishes? 

Knock knock, Who's there?

C.D.

C.D. Who?

C.D. Monkey in the cage?

Knock knock, Who's There?

Pasta.

Pasta who?

Pasta potatoes please!!

Knock knock, Who's There?

Mikey

Mikey Who?

Mikey won't work, can you please open the door?

Knock knock, Who's There?

Rabbit.

Rabbit Who?

Rabbit up carefully, its a present.