The cut off fingers are palce because you don't specify how many, but if you say there are 8 cut off fingers they are palców.
Wrong :/ many fingers = wiele palców. You use palce when talking about finger in plular form.
8 fingers - 8 palców
many fingers - wiele palców
(just) fingers (doesn't matter how many, cutted off or not :)) - palce.
I won't go to that room, because there are fingers - Nie pójdę do tamtego pokoju, bo tam są palce
(there may be 2 fingers in that room, but there may be 8 fingers in that room, or any other number).