Given their environment, would crannogmen frog spears be closer to regular spears or zulu iklwas? Also, opinions on Shaka Zulu?

Crannogmen frog spears are light tridents. 

As for Shaka Zulu, while he was absolutely a military genius, you also have to take into account the damage he inflicted both on neighboring tribes, and on his own people after his mother’s death.