The Mouth of Sauron is a minor character in the third Lord of the Rings novel, The Return of the King.
Background[]
A herald of the Dark Lord Sauron himself, his mouth began decaying and ending up as foul and evil as his words he spoke. The Mouth appeared in the book where he confronts the characters. He also appeared in the 1980 film, The Return of hte King, where he is rebuffed by Aragorn as the mouth says they are outnumbered. Here he is voiced by Don Messick
In the extended version of the film adaptation of The Return of the King, the Mouth of Sauron shows the opposing side Frodo's mithril shirt. After feeding them nothing but lies, Aragorn beheads him when the Mouth mocks them.