Oof, the thing with the trolls sounds rough. Especially near a starter base.

I have an area near one of my swamp resource farming zones that has postage stamp sized bits of plains.

It goes from black forest to swamp... but then after getting nuked by a couple of deathsquitoes, I finally found three small patches of the plains. They're literally like sandbars out in the water, but they count as plains and generate goblins and deathsquitoes. Shrug. I go there to kill abominations, so I'm always geared up for a fight.

The only irritation is getting random bits of non-swamp resources tying up inventory slots. I can bring back the deathsquito needles, but the black iron just accumulates in the swamp base. Not worth a longggggg sailing trip back home.