The Ensign is shown to resemble SpongeBob and his normal attire, but with a blue hat and instead of a red tie, it was a blue scarf tied in a knot.
After Captain Scarfish sent Mr. Krabs to the brig for disobeying his orders to make tonight's dinner disgusting, he assigns two guards, one of them being the ensign who, during the time, was playing with a toy boat. While in the brig, Mr. Krabs manages to get some useful information from the ensign, one of them was that he is an inspiring cook and Mr. Krabs was able to get him to bring down some cooking supplies from the kitchen and teach him how to cook. As the Ensign was making a mini cathedral from cotton candy, Mr. Krabs took some leftovers and made a key. The Ensign revealed that he is the only sailor not sick from the moldy crust that Captain Scarfish had force fed the others as he cooked his own food.
While it is not confirmed, the Ensign might have not looked like SpongeBob. Mr. Krabs may have made him look like SpongeBob to make the story more relatable.