Cuāuhtemōc
Banned
The Vikings would be after loot, so if they went to Morocco and stayed, they would do so because it profitted them. I think the easiest explanation is that they would want to control the sub-Sahran gold trade. I think it provided something like 80% of the gold at the time. That would push them to dominate the entire Magrheb. Plus there is a lot of wealth in Andalusia to raid. If the Moroccan Norse adopt Islam, I can easily see an effective war leader rallying the local Berber and Arabs to build a new Sultanate. Their initial targets are likely to be existing Muslim powers as they have more wealth, so this may help the Christians. Assuming they are able to build an effective state, we may see Muslim freebooters building little kingdoms everywhere in the spirit of the historical Normans.
Hispano-Norse Muslim states in West Africa!