The Finger-Eater by Dick King-Smith - old paperback

Age :7-9

Long ago, in the cold lands of the North, there lived a troll named Ulf who had a very bad habit - he liked to eat fingers! Many, many men, women and children had found their hands a finger short thanks to the razor-sharp teeth of the Finger-eater. And who knows how many more might have suffered the same fate if it hadn't been for the actions of a resolute girl called Gudrun!