Kindergarten Kids Riddles, Rebuses, Wiggles, Giggles, and More! by Stephanie Calmenson illustrated by Melissa Sweet

Rhymes, riddles for the whole year.  A few of them are specific for kindergarten but most of them could be used for any primary day.
A rhyme for show and tell; loose teeth; letters; Thanksgiving; Valentine's Day; 100th day of school.