One place where Vikings and Muslims lived beside one another for some time was Sicily where the Emirate was defeated and replaced with Normans. It would have not been an attractive prospect to convert to Islam since the Muslims were under attack from the Byzantians as well as the Normans.

Charles Dalli, From Islam to Christianity: the Case of Sicily, https://web.archive.org/web/20100821054137/http://www.cliohres.net/books/3/Dalli.pdf

Alex Metcalfe (2009). The Muslims of Medieval Italy (illustrated ed.). Edinburgh University Press