"I'm a troll fol-de-rol, I'm a troll fol-de-rol.. and I'll eat you up for supper!" ~ Troll
The Troll is the chief antagonist of the Three Billy Goats Gruff fairytale and was a monstrous troll whose greedy nature ultimately became his downfall - like many monsters in fairytales.
Once upon a time there were three Billy Goats Gruff - often described as brothers - in search for greener grass they decided to cross over a bridge one at a time: beginning with the youngest, however no sooner had the young goat began to cross the bridge than the Troll emerged - declaring his intention to eat the goat, however the young goat managed to convince the troll to let him past, saying his older brother will prove the troll with a better meal: the Troll is very greedy and thus agrees, sparing the goat as he goes back into hiding.
As the second, older, goat arrives the Troll emerges again and declares his intention to devour the goat - yet the Troll is convinced once again to allow this goat to go free as he is promised an even bigger meal in the form of the third - and oldest - brother: unable to resist the chance of getting his hands on larger prey the Troll once again lets his would-be-victim past before going into hiding for a second time.
However when the oldest goat does arrive the Troll foolishly tries to ambush him with his usual threat of devouring - only to be easily knocked off the bridge by the stronger animal, the Troll is never seen again after this defeat and is presumably either killed or sufficiently humiliated that he moved to a safer hunting ground.