(Psi)SeveredHead
Adventurer
I recall kobolds in one setting throw slimes, contained in fragile clay jars, at opponents.
And one kobold in a huge tribe, clearly what is envisioned here, taking Skill Focus doesn't seem so far out. The Master Trapper of the complex might even have a higher WIS.
Here's a (rather tangential) question: has such a Master Trapper character appeared in a published adventure? I mean, kobolds have featured quite often in published adventures ("The Burning Plague", "The Sunless Citadel", "Crown of the Kobold King"), but did any of these feature the person who made all their traps?