Is Sylvester and the magic pebble a folktale?

"Sylvester and the Magic Pebble" is not a traditional folktale but rather a children's picture book written by William Steig. It tells the story of a donkey named Sylvester who discovers a magic pebble that grants wishes, leading to unexpected consequences. While it shares thematic elements with folktales, such as moral lessons and magical elements, its narrative and style are unique to modern children's literature.