The Ents use Entish in J.R.R. Tolkien’s The Lord of the Rings.
Entish is the language of the Ents, the ancient tree-like beings who guard Fangorn Forest. Treebeard explains that it is a slow, elaborate language, reflecting the Ents’ long lives and their habit of considering matters carefully. Its structure and sounds are described more than they are fully recorded.
Tolkien’s narrative emphasizes that Entish names and speech can be extremely long. Treebeard says that names in his language tell the history of the thing named, so a short translation may conceal much more information than the original expression.
Entish should not be confused with the languages of the Elves, Dwarves, or Orcs. Tolkien supplied substantial linguistic material for several of those languages, while Entish is presented mainly through characterization and translated dialogue. The language helps make the Ents feel ancient, deliberate, and distinct from the other peoples of Middle-earth.