[Morsul the Dark]

ok everyone i finally found the answer it was on page 456 of LOTR(dont check im making that up obviously)

I think it wasn't eaten by an orc rather it was eaten by a Took. It was cut off wondered around and eventually got to the Old Forest just in thime for the hobbits war with the trees all the hobbits took a root from one of the trees and ate as a symbol of their victory. one of the Tooks after all being "a fool of a Took" thought the finger was a root and ate it. that is why there is somthing odd about the tooks and why bilbo found the ring it was attracted to the finger.