Since i deliberatly only explore one particular country within my setting, which is landlocked, theres no real Vikings in the historical sense.
However theres river pirates who ofthen steal their style.
They are usually part of an amphibian race that has both mammalian and amphibian traits, having a streamlined body shape simmilar to an upgright otter, with smooth, wet skin and a paddle tail, elongated heads and beady eyes, they also have heavy countershading simmilar to fish or whales.
They ofthen pop up and demand toll when crossing a river, or theyll just highjack you stuff and toss you into the water.
I do plan on having a Viking inspired faction from the mysterious east that are giant blooded humans with black skin ( think salamanders , not kara boga) that ride giant chariots drawn by strange, huge multi legged beasts, they are around three meters tall and raid the land on behalf of the Sultan across the border. I plan to have some nasty fights on top of moving chariots and stuff like that, could be fun.