Leidang Archer = Well actually,wouldn't it be Ledung or Ledgang?The Ledung/Ledgang was when the chieftain or king called his followers to join him in war.
Leidang Skirmisher = I'm not sure scandinavians had special units of these people
Leidang Spearman = Acceptable
Viking Axemen = All vikings were made for raiding :P,but ok.
Berserker = good
Huskar Swordsman = I think you mean huskarl,its ok.
Huskar Axeman = alright for the flavor
Hirdmann = Hirdman,Hirdmen.Soldiers in the service of a lord
Light Cavalry = good