Heroes 5.5 WarGame Edition - Tactical Edition.

Einherjar

I like it. The sound is good too.

Thunderers

Not as good, but it works.

What about Thanes/Einherjar/Turse?

Excellent option. Here, it's important to understand that Thanes were somewhat in competition with Jarls/Earls (Jarls are chiefs of a higher rank than Thanes, but in the game, they have the same strength).

Mountain Giants

Like Giants, I don't really like these options.

Turse/Einherjar/Earls

Also good.