by the shed their are 3 small trees that are dead tap the trees and tomatoes will apeaer
take them.....

Correct, tap the trees at the shed, the dead ones, and pick all the tomatoes, also go into
the shed and get the salt, use both tomatoes and salt on the river trolls, then use attack
skills and stinging sprites. All the best.

How do I get past the river troll.

make sure you have the sprite that grows things then go to the dead tomatoes by the shed
and click on them