Nice work ! Of course, the typology of the basic spearhead doesn't really change from Iron ages down to early modern period: thick central ridge, thin edges, various forms of swelling (with variants: laurel leaf, heart shaped, long leaf).
The Scandinavians also had a curious weapon, which might have evolved from the "slashing spears" in the sagas mentioned by Bill Skinner-- a long blade on a pole:
http://en.wikipedia.org/wiki/Swordstaff(with a nice illustration of a Swedish militiaman, wearing old fashioned helmet in C16th, and big trousers, ad wielding the sword-staff thingie).