While more can always be said, I hope my following previous posts might satisfy OP's curiosity at the moment:

• Medieval Scandinavians didn't use the term "Viking" to refer to their cultural group. What term did they use? Or did they not perceive enough cultural coherence to merit a unifying term?
• Did the Norwegian endonym of ‘northman’ and its derivatives develop independently as a result of internal geopolitical dynamics, or was it somehow influenced by the perceptions of peoples outside of Scandinavia (e.g. victims of viking raids)?
• Did the Vikings refer to themselves as “Northmen” within Scandinavia? also answered by /u/Platypuskeeper

+++

The following (except for the first and the last) are very crude summary of these linked previous threads:

• First of all, the predominant majority of historians generally tend to avoid the use of the word "tribe" now (at least they have been since the late 20th century). Late antique or early medieval groups of people (called ethnos in Greek and gens in Latin) are now primarily defined as a political group or the shared cultural tradition, rather than as an ethnically homogenous group.
• From this point of view, the evolution process of "Norway" as an polity or a political community could be a bit tricky - "Norway" had probably been just a geographical term to denote the western coastal region of Scandinavian Peninsula, and it first turned into the name of the kingdom (political community) mainly in course of the 11th century, in the light of the possible political rivalry against neighboring powers like Denmark.
• In the oldest usage (about 900), a local chieftain named Ohthere (Ottar) from northern Norway who narrated the surroundings of his homeland to King Alfred of Wessex certainly called himself "Norwegians (Norðmenn)", distinct from their northern hunter-gathering groups of people, called Finns (usually identified with the now Sámi people rather than Finlanders). He apparently also distinguished this Norðmenn (inhabitants of now coastal western Norway with a rather sedentary lifestyle like agriculture in contrast to hunter-gatherers (?)) from the Danes and the Sveas (Swedes).
• On the other hand, the king of Viking Age and Medieval Norway (at least down to the end of the 12th century) continued to sometimes be referred as "a ruler/ king of the people of the local district (fylki)", such as a ruler of the people of Hordaland (a district name of western Norway). So, "Norwegian" identity and more local ones could co-existed side by side, or, we can perhaps ask what kind of meaning the former one sometimes in fact had in Late Viking Age.
• How to translate the related terms on Sweden and the Swedes before the 12th century is also a very, very difficult issue. We don't know for sure whether Sviþjóð in Old Norse (at least until the 11th century) could be translated as "Sweden" (as now from modern Icelandic) rather than "Svealand" [a district name in central Sweden].