Algarick Ogglebert

Algerick Ogglbert, also known as Jurassic the Red, and Oiler, is the father of Alvin the Treacherous. Ogglebert is the son Thugheart and Second Chief of the Outcast Tribe. He was said to be quite fearsome and his was given the titles, Jurassic the Red, AKA Oiler. He is never seen or mentioned at all by anyone in the books, so it is assumed that he is deceased.

Ogglebert was only mentioned in How To Break A Dragon's Heart, as shown on the Hiccup's Family Tree.