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. 
That specifically looks like Cossack hair. Shaped in back with a long loc up front. Bonus if you put that into a braid it would sit under a helmet and give a bit of nice extra padding.
the hair honestly looks badass, sucks that russians use it as a slur
There are still some cossack larpers in kuban tho.