See above,sons of Abraham.
Can you do it,in the name of Allah?
The main issue is that Scandinavia is far, really far from Islamic centers, giving almost no incitative to do so. Scandinavians seemed really being about keeping their old rites, and finally were opened to Christianism because of obvious, and relativly powerful, Christian neighbours.
That quite the problem core : Christian big kingdoms (critically in comparison of scandinavian puzzle) were the target of raids that looted religious objects, sometimes Christian slaves. Eventually Christianisation was the result of double effort : from Frankish and German missionaries, that had no real result before Scandinavian rulers supported them in order to use Christianism to reach, from a popular kingship that gave a limited by gathering power, to a vassalic kingship based on what existed in Christian kingdoms (and on interpretation of Christian theology. Basically the king was "God the father" of his land, resumed caricaturally).
In the same time, the raids against Arabs were...limited. Even if a PoD made the expedition in Muslim Spain sucessful (something that given what the Arabo-Andalusian fleet was, would need for a good PoD), it was far and limited to exceptionnally big and lucky takes (think of Celtic expeditions in Italy and Greece).
It would be far more easier to have sucessful Norses settling Spain, converting and being consideredto as free Saqaliba.
A conversion by Norses being really implausible, would a conversion by Varangians could do?
Admittedly, there's a slightly better chance. Have Constantinople falling into Arab hands at some time, and the trade roads on Volga and Dniepr could be both dominated by Islamic traders, instead of having the Dniepr road being a Byzantine highway.
In whatever would replace Russia there (likely butterflied by the PoD), Varangian traders would most probably encounter more Islamic influence.
It won't be easy, as Christians neighbours are still much closer and much more dynamic : putting it simply, Islam didn't really knew at this era another mode of mission than "mission by sword", and a great expedition all trough *Russia to Scandinavia is likely to be ASB. Furthermore, they could deal with non-Islamic rulers and it actually served them relativly well, as it reinfiorced a position seen as superior.
On the other hand, Christians did had an important missionary drive. By cultural exchanges, sword and/or teaching. Christianisation was seen as definitely important for diplomatic features (the only modern comparison I can think of, would be the difference for a state recognized by UN or not).
Still, as thin it is, it's still your best chance for this precise OP.
Vikings on their travels encounters some imams that are hospitable
The only contacts between Vikings and Islamic imams were when the former tried to plunder the latter. Not the best background for theological debates, some can say.
More seriously, I could see some Vikings integrating Islamic teaching. It sounds unlikely at first, but why not.
They are, however, likely to integrate them in their existinc religious and cultural structures, rather than adopting the religion. See, the main difference between Christianism and Islam is that the former is more proteiform, more likely to adapt itself to new cultures; when Islam is a political religious structure that is highly hard to modify without falling automatically into something that can't take the name.