A whiffenpoof was a tool for training Boy Scouts in tracking skills. The whiffenpoof itself was a small log, about the size of a stick of firewood, with nails driven into it on all sides, so that it bristled with nails. This was dragged through the forest on a short leash, by the older Scouts who were training the younger. It might thus create a track that the tenderfoot must learn to trace out. Or it might, alternately, be dragged across a trail in order to confuse the trackers. The fewer nails that were driven into it, the more difficult and subtle was the effect.