These are pretty bad. Feel free to use them if you got nothing better. ;-)

It's hard to create 'safe' & 'comprehensible' jokes for a younger audience...

DRAGON JOKES

How do Dragons like their chicken?
Answer: Extra crispy.

What did the Dragon say when watching a very long play?
Answer: "This is dragon on too long."

What did the dragon say after he was thanked by the princess for lighting a candle with his fiery breath?
Answer: "That was a singe."

What's a dragons favorite phrase on a hot day?
Answer: "Man this is a scorcher!"

What do you call a lowrider owned by a Dragon?
Answer: A "dragon wagon!"

Who do you call when you have a sick, sneezing dragon?
Answer: The fire deprtment

Good luck!

;-)