He is an octopus that looks a lot like Squidward. He wears a brown shirt with a blue bow and a navy blue hat with a red strip on it. He also holds a clarinet in his hands
He appeared in Pull Up a Barrel as one of the two guards watching Mr. Krabs. Like Squidward, he also plays the clarinet. After, when Mr. Krabs went to the Sick Bay, him along with a few other sailors were there.
While it is not confirmed, this sailor might have not looked like Squidward. Mr. Krabs may have made him look like Squidward to make the story more relatable.