For silly poems that get kids giggling, nothing beats the lunacy of Edward Lear
There was an Old Man of the Hague,
Whose ideas were excessively vague;
He built a balloon, to examine the moon,
That deluded Old Man of the Hague.
Of course, these are aimed at younger readers so there’s an innocence and sense of fun that appeals directly to children. Not only are they comic, they really do encourage kids to try writing some limericks all by themselves. Spread the joy. Faber & Faber, age 5+