Well, there were blacks (Moors) on the Muslim raiding ships which were kidnapping people to sell in the Arabic slave markets. It could be possible a black face was seen once in awhile. Really, it could be.
https://www.historynet.com/how-long-did-the-moors-have-white-slaves/
yes but this is a movie about Vikings not muslim moors running around the place. Point being political correctness has no place in re-writing history.
If you are doing a movie on Vikings and Nordic people use nordic people
If you are doing a movie on Muslim Moors use muslim moors.