WHOA!
Vikings used spears, OF COURSE they did! It was even one of the most common weapons due to the cheap price (less metal).
For Reference, see:
HEATH, Ian: The Vikings. Oxford 1985
NICOLLE, David: Medieval Warfare Source Book. London 1985
PRESTWICH, Michael: Armies and Warfare in the Middle Ages. New Haven 1996
WISE, Terence: Saxon, Viking And Norman. Oxford 1979
... and a million other History Books.
Excavations have brought unnumbered spearheads to light, they all were used by vikings.