These are very nasty beings under the leadership of LEMPO, Lord of Demons. They do all his dirty work, and some of it is very dirty indeed.
They love trapping and tricking innocent folks who walk through the forests — and you may be forced to answer a riddle to save your life.
Unfortunately, in this situation there is no opportunity to ask the audience or phone a friend. Better keep your wits about you when you go out for a walk.. and carry an encyclopedia.