The First Thing to Do When Creating Your Fantasy Setting

Determine how many workers at the gold and the trees are optimal. Your readers will notice deviations from the meta in the starting minutes, which can contribute to characterization.

Addendum

Deciduous tree monsters look like warriors in summer and wizards in winter, but they're actually rogues. They're just limited in their opportunities.

Nuances of Fantasy Professions

I bet successful lumberjacks are both educated and canny beyond most, what with all those dryads and forest spirits and whatnot that can cause them trouble. If there are outright tree monsters, the lumberjacks must be powerful champions as well.