Short version: they looked a lot more like 
than 
. Most accounts of Vikings that are contemporary of the centuries where shield-Danes and spear-Danes went "a-Viking" describe distinctly hygenic people that bathed and took care of their hair (and wore it long).
EDIT: I thought I could have a little fun with a very loosely associated Beowulf reference to Danes (and even more loose associations with Geats therein too) but I got the 
experience for doing so. 
They didn't have Hitler Youth fades with lazy and sloppy beard fusions. Period. Full stop. Stop doing that. Looking right the fuck at you too, P R E S T I G E T V. 
Considering what tends to get talked about by its consumers when I hear about such shows, unfortunately yes.
If it isn't there for entertainment, pinkie swear, why is it there? Do billion dollar franchises emerge and maintain themselves entirely on a cloud of pious historical accuracy (with historically inaccurate names, locations, costumes, and also a side order of ice zombies and dragons) and the scholarly enthusiasm of those that are strictly there for academic discussions of utterly fictionalized people historically accurately feasting and enjoying atrocities?