"Lyle, Lyle, Crocodile" is a children's book written by Bernard Waber. It tells the story of a friendly crocodile named Lyle who lives in a house in New York City with the Primm family. Lyle is unique because he enjoys singing and has a gentle personality, which endears him to the family and their neighbors. The story explores themes of friendship, acceptance, and the importance of being true to oneself. Lyle faces challenges, particularly with a grumpy neighbor named Mr. Grumps, who initially dislikes him. Ultimately, Lyle's charm and kindness help him win over the community.