Can I sneak/farm myself some higher level gear by going into mountains/plains too early?

I only have troll armor in the swamps and located a plains biome on the edge where I killed some of those little goblin guys for back metal (or something line that).

Can I quickly build myself a base there where I’m protected and lure some of those closer so I can can kill them while dodging deathsqitos?

Or build a quick portal in the mountains and farm for silver there? I don’t wanna waste iron on armor and armor from root armor isn’t really enough and annoying to farm even with a bonfire.

That’s why I thought it would be cool to sneak myself some armor from a biome that’s still too difficult ( haven’t killed bone mass yet)