Many people have the same misconceptions about Viking weapons as they do about horned Viking helmets. On their website, Hurstwic, a Viking-Age interest group based in New England, discusses the reality of Viking axes.
From the website:
When people think of Viking age weapons, they usually think first of the battle axe, and the image that forms in their mind is a massive weapon that only a troll could wield. In reality, battle axes in the Viking age were light, fast, and well balanced, and were good for speedy, deadly attacks, as well as for a variety of nasty tricks.