Whatever their name, everyone can spot a sycophant a mile away.
A parasite, or talebearer. Also lick-spittle, “sycophant, abject toady, one who will do any repulsive thing,” 1741, from lick + spittle. Phrase “lick the spittle” as a repulsive act is from 1640s. A person who behaves obsequiously to those in power.
I couldn’t decide who fit the term best: Alfrid Lickspittle of two installments of The Hobbit (The Desolation of Smaug and The Battle of the Five Armies), or Grima Wormtongue of two episodes of The Lord of the Rings (The Two Towers and The Return of the King).
Choose for yourselves.
My money is on Wormtongue. Although I loved the sheer silliness and irredeemable character of his scenes, Alfrid’s part in the Hobbit movies was a bit too Jar Jar Binks for me.