Who was the mummified body in the bunk at the end? All the men left the ship, none of Hickey's group made it back and the three men set by Crozier to trail them couldn't possibly have made it that far with no supplies to speak of. And what was the significance of the enlarged, rodent-like teeth? Was the ship sailed to its last position far to the south of where it was abandoned or did it drift as the ice melted in Summer or was carried by the natural movement of the ice?
no idea but there actually is an inuit legend about people going on a white mans ship and discovering a body like this. no one knows whether it is just a legend or it really happened and what or who the strange body was.
It wasn't the three men sent by Crozier to trail Hickey, they all died. It was Reuben Male, Robert Sinclair, and Samuel Honey, the three men that hiked from the camp on their own overland. They're the only ones that it could be, moreover when Crozier thinks this, he believes he can almost hear their voices.
As for the teeth, I always thought that was just because the gums had shrunk back exposing the whole tooth, making them look strangely long.
I also got the impression that the ship had been sailed to that point by the three men. They'd clearly been on the ship for a while as they'd drank all of the rum.