My research indicates that that pupation only occurs in a group of insects that undergo holometabolism and is proceeded by the larval stage, which I imagine is similar to a wriggler. However, those that reach the imaginal stage are anything but humanoid.
Your race is unlike any troll I have heard of before, though I admit I have not done many studies on the subject.
[text]
Your race is unlike any troll I have heard of before, though I admit I have not done many studies on the subject.