In J. R. R. Tolkien
is the Sindarin
name of the Ent
The Fangorn Forest, where he and the other Ents live, is named after him.
Meriadoc Brandybuck and Peregrin Took pass this forest in the second volume of The Lord of the Rings, The Two Towers. There they meet Gandalf again and travel to Helm's Deep with the Ents.