It looks tribal and it looks dead, but there are no weapons sticking out and no sure sign of it being dead. The man might still be alive...or not. The body is draped over some piece of wood, caught in it or hanging on to it.
Edit: In order to get to the man/corpse one of you would need to expose him- or herself to potential observers and get a little wet, assuming at least 1 rank in Swim. Or you could just go closer and wait until you are able to see more details. Your call :)