Hun-grrr
From Multiversal Omnipedia
Hun-grrr was the leader of the Terrorcons. Smarter than his compatriots, his alternate mode is a two-headed creature similar to a wingless dragon. Of note is his unusual attack in monster mode, where one head devours solid materials like rock around him and the other head fires the fragments as projectiles.
Comments
His name is sometimes spelled "Hun-girr" or "Hun-grr."