In the Shadowrun Wiki, under "Insect Spirits", it is said that Dunkelzahn's Will "places a bounty for the capture of insect shamans." But in the same source site, under "Dunkelzahn's Will", blood shamans and toxic shamans are given bounties, but I don't find an entry for insect shamans.

Is there some official source I can search that does mention insect shamans?

I distinctly remember reading about these bug bounties in earlier editions, but on the fly I can only find them mentioned in relation to the Astral Space Preservation Society (which is, of course, an arm of the DIMR) in 5th edition's Street Grimoire (p. 58).

Had a look at the original Portfolio of a Dragon...lots of cool stuff from way back when, but the only bounties are one million for living blood and toxic mages delivered to the Draco Foundation.

Yeah, it looks like that is so. Maybe the Azzies would pay for one or two.