Squog is an ancestor of Squidward Tentacles. He was alive during the B.C. era. He enjoyed painting like his descendant, Squidward, but unlike him, could paint prodigiously. He is not shown playing an instrument, but it can be inferred that he could do that well too, as the bad-clarinet-playing part of his line started with Squidly, from the Medieval Era. 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. Squog has appeared in "Ugh", "Atlantis SquarePantis," and the PC version of "Lights, Camera, Pants!" when you go to the Past.
He is oldest 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.
Squog mostly looks like Squidward except for the following:
Squog more often smiles instead of frowning.
He wears a leopard fur one-shouldered ragged tunic.
He has one tooth like SpongeGar, but on his bottom jaw.
He has a thick unibrow. (Similar to Squilliam, but Squilliam's is not rectangular)