Grace's Homemade knock knock jokes

Knock knock.
Who's there?
Crab.
Crab who?
Crab door?

Knock knock.
Who's there?
Turtle.
Turtle who?
Turtle Curtain.

Knock knock.
Who's there?
Duck.
Duck who?
Duck light.

Knock knock.
Who's there?
Fish.
Fish who?
Fish Store.