So The lore of these guys seems pretty sparse but I didn't see these guys in planned features, unless they are being added in with the men of Bree.
Links of evidence they exist
https://lotr.fandom.com/wiki/Enedwaith
"fairly numerous but barbarous fisher-folk" wandering the coast.
The Armor Should look like this, it would be really cool.
Propositions
I propose a fisherfolk faction living in Enedwaith that Tolkien talked about with a brown sort of leathery looking armor. And a rusted steel variant.
Again if everyone hates the idea sorry XD
They should have different fishing rods that you can purchase from traders that may catch rarer types of fish. (Obviously more fish would need to be added too.) They should probably live in shacks like the men of Laketown may live in however not suspended over water. They should be kinda cabin like.
It would also be cool if they maybe had like a sort of fishing spear or pike made of iron. Dunno just some general ideas, what do you all think?