Summer Reading Program Riddles

What do you get if you cross a galaxy and a toad?

Star Warts!
What do you call it when there are a bunch of giraffes stuck on a street?

A gi-raffic jam!
Why shouldn't you believe what dragons say?

Because they're full of hot air!
What's gray and wrinkly and jumps every 20 seconds?

An elephant with the hiccups!
What does a unicorn call its father?

What's soft, white, and comes from Mars?