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They're not quite the same thing but the fates Clearing the Hive, Attack on Highbridge Act III, and one of the three fates over at Poor Maid's Mill in Upper La Noscea reward an npc in the respective area that sells items in those areas until the fate spawns and is then lost, which sell minions you can only get from them.
They're the Baby Raptor sold by the Boughbury Trader for Clearing the Hive
The Tiny Rat sold by Chachamun for Attack on Highbridge Act III
And the Baby Bat, sold by Junkmonger Nonoroon for clearing either Poor Maid's Mishap, Poor Maid's Mess, or Poor Maid's Misfortune. Doesn't seem to be a clear answer which, or it might just be any of the three. It does take him a while after the correct fate is over to show up, he slowly waddles in from outside the area iirc to take up his spot near one of the houses.
As far as I'm aware there aren't any other fates that reward npc shop spawns, which make them sort of unique.