Products featuring Elephant and Piggie include plush toys, finger puppets, temporary tattoos, note cards and a licensed soundtrack. A full list of licensed products, including the Elephant and Piggie children's books, is available on the blog/website of the series creator, Mo Willems.
Mo Willems is an author illustrator and creator of children's books. He has written for Sesame Street and has twice been award the Carnegie Medal for Excellence in Children's Video. Some children's books in the Elephant and Piggie series are "My Friend is Sad," "Today I Will Fly!," "I Am Invited to a Party!," "There Is a Bird On Your Head!" and "I Love My New Toy!"