It seems like the neuron whip is a weapon uniquely suited to Trolls:
She shuddered at the thought of the whip. The Kangas had rejected it as inefficient, but the Trolls loved it. It went after nerve tissue and incapacitated its victims instantly, but death took long, terrible minutes, and it was lethal up to twenty meters from its point of focus. Its effects were far slower at the greater range, but they were no less certain or agonizing. Not even a Thuselah could survive a direct hit, and they had a less than even chance of surviving a near miss.
It is clear (both from textual analysis - and the in-universe canon from quote above) that it was rather poor choice of weapon to practical and logical Kangas.
Does that mean that Trolls developed their own weapons? Because it seems unlikely that Kangas would even bother developing something that illogical.