Did norwegians fight with the vikings?

Answer 1

Ethnicities are not static. This means that the idea of being "French" or "Chinese" is invented, not an eternal state of nature, and is often determined by localized and immediate factors. The ethnicities and nationalities of "Swedish" and "Norwegian" do not go back to the Viking period and are, in fact, a reaction to the end of the Viking Period when the Scandinavian peoples were finally able to settle into agrarian societies of their own.

Since there are no such things as Swedish and Norwegian Vikings, the question as written is impossible to answer. However, if the question is read to be asking about the relations between neighboring Viking Tribes, these would alternate with the differing needs of the tribes. If they needed to trade goods, they would maintain amicable relations, but if they wanted direct access to a certain piece of land or to avenge a personal grievance, they would attack each other quite violently.

Answer 2

The Norwegians were Vikings...