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He looks similar to Squidward, except Squog has a five o'clock shadow, a unibrow, a little bit of 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 cried when Squog chose 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 is seen painting a picture of his own head inside one of Atlantis's paintings when the head comes alive with Squidward singing. He then gets scares and runs away.
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 because they married into the family. However, it is possible that he is ancestor of them too.
The YTV captions spell Squog's name as Squd.
He does not seem to mind SpongeGar or Patar, unlike his descendant, Squidward, who abhors SpongeBob and Patrick.