User blog comment:World - eater123/skyrim easter egg giant club weapon/@comment-3217145-20130515161139

That's not an easter egg, it's a bug. I had the same thing happen at another camp. Somehow a giant's club got out of their hands, and it appeared to be grabbable (displayed weight and attack and stuff) but couldn't actually be obtained. It has weird properties (like a value of 1 gold) and can't be obtained by the player, indicating that it isn't supposed to happen. It's on the talk page for giants.