What does the term "Polywog" signify in military slang?

The term "Polywog" signifies a sailor who lacks experience in crossing the equator. In naval tradition, when sailors first cross the equator, they are often considered "Polywogs." This experience usually involves a rite of passage ceremony, where they may have to endure a series of challenges to be formally recognized as a "Shellback," which refers to the sailors who have successfully completed this crossing and undergone the associated initiation.

This understanding is important in military culture as it highlights the tradition and camaraderie that comes with such experiences at sea. Newer sailors, referred to as Polywogs, are distinguished from the more seasoned Shellbacks, emphasizing the journey and growth that occurs during a naval career. The other options do not capture this specific meaning, as they relate to different aspects of naval service or experience.