Jack and the Dragon's Tooth:

 

Two bickering brothers, a deadly tooth and a swarm of talking mosquitoes… Jack doesn’t go looking for trouble, but trouble is very fond of him. So when Jack offers to help a prince with his quest, they both get more than they bargained for! A funny, fast-moving and thrilling folk-tale from Ukraine.
 
Part of the Barrington Stoke Reloaded Fiction series which also includes Thor and the Master of Magic by Kevin Crossley-Holland, Bima and the Water of Life by Francesca G. Ewart, and The Goblin of Tara by Oisin McGann.

‘These four recent books from Barrington Stoke are each so superb in story, writing, design and illustration.’
www.boysintobooks.co.uk