The Cook

 The Cook is a victim of the S.S. Pequod's crash. He is an American professional cook.

Role In S.O.S Island
The cook was perfectly fine, till the Captain rammed the ship into an iceberg. While he was getting some vegetables in the freezer, the ship crashed trapping him and freezing him in the process. Sometime later, help comes and finds him in a block of ice. The rescuer pushes him to and thaws him out in an oven. He told the rescuer to save the Captain. After that, he still offers to cook.

Trivia

 * He was frozen along with a tomato, an orange and a head of lettuce.
 * According to the Poptropica Tips and Tricks app,his name is Flask