Yes and no. It depends on who you're talking about and at what point in time. Swords were much more expensive than other weapons because they require more metal

Yes and no. It depends on who you're talking about and at what point in time. Swords were much more expensive than other weapons because they require more metal and are more time-consuming and labor-intensive to make, so your average viking couldn't necessarily afford to buy one. That's also why you tend to see swords buried with vikings: those who could afford or who warranted a fancy burial tended to be those who could afford to buy swords. The prevalence of swords increased throughout the viking age (which ended roughly some time in the mid to late 1100's). That happened mainly for two reasons: One was that the Vikings were engaging in a lot more pitched battles against Anglo-Saxon and Frankish armies, who tended to carry swords. Of course they'd steal swords off dead soldiers, so the number of swords in circulation among vikings increased. Second, as viking power grew they were able to broker arms deals (occasionally as part of "tribute" payment) with Frankish rulers and with vikings who'd been gifted land in Normandy in exchange for warding off other vikings at the mouth of the Seine. I'm not aware of anyone actually fighting with a hammer. Axes were very common because they were so cheap that virtually everyone had one- even farmers. Pikes were definitely used on occasion but were more special purpose tools for pitched battles. Bear in mind that vikings didn't really want to fight pitched battles at all if they could help it. They were raiders. The word viking ("wicing") is the Anglo-Saxon word for "pirate." The Codex Regius, which is the written source of most Norse mythology and thought to be written around the mid 1200's, is replete with references to both swords and axes. Otherwise, most of what we know about vikings and their weapons comes either from what the Anglo-Saxons wrote about them or archaeological studies.