Every generation goes through a ridiculous hair phase

That's real. Vikings did a lot of breading and added beads to beards and hair. They also sometimes shaved the sides and had asymmetric haircuts too. We know the hair styles from their graves. The length of hair varied. They let them grow out and cut them when they were long enough. You could do a lot of things with such long hair.

The viking hair styles you see in the movies are mostly real.

But vikings did not have dreadlocks. They probably didn't know about them.
This is wrong:

And this is wrong too:

They also often wore necklaces and wristbands with runes made of silver, iron or wood. Something like this:

This was to either show your wealth or as an amulet. The futhark (runes) were not just an alphabet they also were magical characters. Each rune had its own special meaning.
For example ᚠ (fehu, engl. cattle) stood for wealth, abundance and security. You wore that rune if you wanted that. And smiths added runes to tools and weapons to add magical powers to them.