Gill Lewis 
Willow Wildthing and the Dragon’s Egg [PDF ebook] 

In the Wilderness, where magic and nature collide, there are magical creatures and strange powers at work. In this story the Wild Things — a group of children who have taken on the characteristics of the wild creatures they are named after — discover another group, the Bark Skins, have taken over their camp, and won’t give it back. A battle of the camps begins with witches, dragons, dragon’s eggs and the two warring clans. Can they resolve the dispute and live alongside each other in The Wilderness?