A.H.
Doreen Cronin has several silly stories about barnyard animals like Click, Clack, Moo-Cows that type and several other titles with the same characters. They are pretty funny even for adults!
Can you use poetry? Jack Prelutsky and Shel Silverstein have great rhymes that are outrageously silly and funny. They would be easy to put to actions too.
HTH,
A.