Jazzoo and the Wild Men.   

A fantasy novel.
It is the Stone Age.  For centuries ice lay on the land, but now it has gone.  The years of cold are ended. The great deciduous forests have again spread up from the south and Europe is covered in oak and beech and birch.  And in these woods waves of men have made their homes. 

Jazzoo, a young boy, abducted as a baby with his mother by raiders from the neighbouring valley, has started out from his settlement
to find his father and reunite his parents.  He expected danger and adventure in the wilds.  He was completely unprepared for what he found.