Zardnaar
Legend
As others have said, that they're spawned in vats is mostly irrelevant. If it is genuinely demonstrable (and discoverable) that no giak is capable of existing with independent behavior unless you use something like a wish--aka one of the most powerful spells around--to make one, then I'm comfortable viewing them as....basically meat-puppets.
Potential question: What would happen if you could somehow sever the dark presence that controls a given (living) giak without simply killing it? (Think the equivalent of "put inside a solid lead Faraday cage, but for dark power--nothing gets in, nothing gets out.) Would it live? If it did live, would it still have the capacity for thought?
In the novels they did have one free willed goal that ended up helping the forces of good.
Their culture as such is imposed from the top down the darklords are essentially meat puppets of the god of evil.
Said Giak was a DM special created by an arch mage.
It's not 100% clear how much free will the Giaks have. They're essentially unnstural creations created for slavery then used as Cannon fodder.
Most of the creations of the darklands via the vats are essentially meat puppets they have a few species serving them that while evil are theoretically free willed. Dark magic has been used to bind them to the darklords and enable them to survive their environment.
They don't bother trying to redeem them after interrogation any captives gonna be executed.