He looks similar to Squidward, except Squog has a five o'clock shadow, a unibrow, some black hair on his head, and one tooth. He also wears a stereotypical caveman outfit instead of a shirt.
He owns a house and two clubs, and apparently the clubs have emotions of some sort, as one cries when Squog chooses the other to go yell at Prehistoric Gary with. Mostly, he slips on the slime trail of Prehistoric Gary. His neighbors are SpongeGar and Patar.
He enjoyed painting like his descendant, Squidward.
Squog makes his debut in this episode. His personality is the same as Squidward's. He discovers fire in this episode along with SpongeGar and Patar, who are also his neighbors. Squog likes hitting SpongeGar with a club and was fighting for the log which contained fire.
A giant jellyfish stings him and he runs to his house in pain. SpongeBob comes and gives him, Kevin's ointment and his wounds disappear. Later, SpongeBob asks him to be an actor in "The New Adventures of Mermaid Man and Barnacle Boy" and he accepts it.
He is the oldest known member of the Tentacles family, and he has six tentacles like the rest of the family, but he too is an Octopus. One could infer that a mutation that goes back to Squog or even further back in time could be the reason that the family has six tentacles. However, this does not explain Mrs. Tentacles and Grandma Tentacles since they married into the family. However, it is possible that he is an ancestor of them too.
The YTV captions spell Squog's name as Squd.
He doesn't seem to mind SpongeGar or Patar, unlike his descendant, Squidward, who hates SpongeBob and Patrick.