Knole’s Tree Troll Trail Suitable for 4+ but older children need to be in the group that the younger children will follow – and remember you're never to old to have fun! What follows are a examples of trees in which faces and animals can be seen – but what one person can see another may not. Not every Tree Troll has been found – there must be hundreds ‘living’ the park. There is a video showing a route on which many can be found.