Sudanese spearheads with handles & arrow heads???

[katana]

Received these today, I am assuming that these are Sudanese.
Three socketted spearheads fixed to handles. Two handles leather covered,the third,possibly Monitor lizard. Does this type of weapon have a name? Obviously it was used as a stabbing blade, where these improvised for 'close quarter' fighting?
Also with these pieces I have two arrow heads ? made in the same style with a socket fitting, surely too small for spears? Any suggestions gratefully received......