A triantiwontygong is a fictional creature from the Australian children's book "The Triantiwontigongolope" by author and illustrator James Marshall. It is described as a whimsical, fantastical animal that embodies the playful and imaginative spirit of children's storytelling. The term is often used as a tongue twister and showcases the creativity and humor in children's literature. The creature has become a symbol of fun and fanciful imagination.