What happens when a cat eats a lemon?
It becomes a sour puss!

Why are elephants wrinkled?
Have you ever tried to iron one?

Why do elephants never forget?
Because nobody ever tells them anything!

What day do fish hate?
Fry-day.

What do call a bear with no ears?
B!

Where do cows go on Saturday nights?
To the MOOO-vies!

Why is it hard to play cards in the jungle?
There are too many cheetahs!

When is it bad luck to see a black cat?
When you’re a mouse!

What time is it when an elephant sits on your fence?
Time to get a new fence!

What does a kitten become after it's three days old?
Four days old!

What do you get when you cross a parrot with a centipede?
A walkie talkie!

What kind of animal goes OOM?
A cow walking backwards!

What animal has more lives than the cat?
A frog, he croaks every night.

What is a crocodiles favorite game
Snap

What happens when a frog’s car breaks down?
He gets toad away.

What do you get when you cross a parrot with a pig?
A bird who hogs the conversation.

What did one flea say to the other flea?
Shall we walk or take the dog?

What do you get if you cross a crocodile with a flower?
I don't know, but I'm not going to smell it!

What’s the difference between an injured lion and a wet day?
One pours with rain, the other roars with pain!

What is the strongest animal?
A snail. He carries his house on his back!

What is the difference between a flea and a wolf ?
One prowls on the hairy and the other howls on the prairie!
Here is the list of knock knock jokes, puns, and riddles for children and kids:
Q: "Knock, knock….Who's There?…..Ashe……Ashe who?"
A: Bless you!

Q: "Knock, knock…..Who's there?…..Nobel……Nobel who?"
A: "No bell, that's why I knocked!"

Q: "Knock, knock…..Who's there?…..Leaf……Leaf who?"
A: Leaf me alone!

Q: "Knock, knock….Who's There?…..lettuce……lettuce who?"
A: Lettuce in and you'll find out!

Q: Knock-knock…..Who's there?…..Aaron……Aaron who?
A: Why Aaron you opening the door?

Q: "Knock, knock….Who's There?…..Tank……Tank Who?"
A: You're welcome!

Q: "Knock, knock…..Who's there?…..Hawaii……Hawaii who?"
A: "I'm fine, Hawaii you?"

Q: "Knock, knock…..Who's there?…..Orange……Orange who?"
A: Orange you even going to open the door!

Q: Knock-knock…..Who's there?…..Gray Z……Gray Z who?
A: Gray Z. mixed up kid.

Q: "Knock, knock….Who's There?…..Who……Who Who?"
A: Is there an owl in there?

Q: "Knock, knock….Who's There?…..Anita……Anita who?"
A: Anita to borrow a pencil.

Q: "Knock, knock….Who's There?…..Woo……Woo who?"
A: "Don't get so excited, it's just a joke."

Q: "Knock, knock….Who's There?…..figs……Figs who?"
A: "Figs the doorbell, it's broken!"

Q: Knock-knock…..Who's there?…..Alice……Alice who?
A: Alice fair in love and war.

Q: "Knock, knock….Who's There?…..Annie……Annie Who?"
A: "Annie thing you can do, I can do better."

Q: Knock-knock…..Who's there?…..Yukon……Yukon who?
A: Yukon say that again!

Q: "Knock, knock….Who's There?…..Boo……Boo Who?"
A: Well you don't have to cry about it.

Q: "Knock, knock….Who's There?…..Theodore……Theodore who?"
A: Theodore is stuck and it won't open!

Q: Knock-knock…..Who's there?…..Cher……Cher who?
A: Cher would be nice if you opened the door!

Q: "Knock, knock….Who's There?…..Amos……Amos who?"
A: A mosquito bit me!

Q: "Knock, knock….Who's There?…..Police……Police Who?"
A: "Police let us in, it's cold out here!"

Q: Knock-knock…..Who's there?…..Amarillo……Amarillo who?
A: Amarillo nice guy.