Culture
Norwegian
set_culture norwegianCulture ID norwegian. set_culture changes the culture of the character you play; change_culture <county id> norwegian changes a county's. Both need the debug mode (launch option -debug_mode).

Traditions
The traditions this culture starts with, and what each one does.
StorytellersSocial-15% Scheme Secrecy, +5% Legend Spread Chance
Runestone RaisersRitual
Ting-MeetRegional
Maritime MercantilismRealm+10 Republic Vassal Opinion
Added with a DLC
- Coastal Warriors with The Northern Lords
Bellicose ethos
This culture considers conflict and violence to be necessary states of existence; ingrained in its people is the idea that one should stand up and fight for their own.
Martial custom: Men Only
- Only men can be Commanders and Knights
Other North Germanic cultures
Source: game/common/culture/cultures/00_north_germanic.txt, game/common/culture/traditions/00_societal_traditions.txt, game/common/culture/traditions/00_ritual_traditions.txt, game/common/culture/traditions/00_regional_traditions.txt, game/common/culture/traditions/00_realm_traditions.txt, game/common/culture/pillars/00_ethos.txt, game/history/provinces (counties at the start) and the English localisation, Crusader Kings III 1.20.0.3.