A Bad Case of Tattle Tongue by Julia Cook (2005)
Josh the Tattler doesn't have any friends. He tattles on his classmates, on his brother, and even on his dog! He tattles so much that he wakes up one night to find that his tongue is yellow, unusually long, and covered in bright purple spots! Will a bad case of Tattle Tongue teach him a lesson? A Bad Case of Tattle Tongue gives teachers and counselors a humorous, cleverly creative way to address the time-consuming tattling-related issues that often sap classroom energy and thwart teaching opportunities.