Humphrey, Kris-Leo's Map of Monsters The Spitfang Lizard

As the Guardian's apprentice, Leo Wilder must protect his village from the monsters that lurk in the surrounding forest. Armed with a slingshot, magical stones, and a strange map, Leo must track down two deadly spitfang lizards before they reach the village. 

He is given one piece of adviec--first the spit, then they bite. If you see a spitfang's throat swell up...... RUN!