There is an awful lot here! I do not have time to carefully reread it all, nor to respond point by point. My sense of things is as follows (and I apologise for not having time enough to do proper research and citations).
Trolls, according to the Entish view, are made in mockery of the Ents. Perhaps the Ents are right. Yet this does not tell us the process. We can allow that Morgoth and Aule, being alike, might have hit upon similar methods for their works: respectively, Dwarves & Trolls. Dwarves were animated by Eru. Primordial trolls and giants may have been animated by Morgoth in a process similar to the animation of dragons and the posession of Carcaroth, a spirit of some kind is ensnared in the created or procreated form. If the trolls are like orcs to the elvish view, then the original spirit(s) may indeed have been corrupted elves or maia. There may even have been some long process whereby a creation/subcreation of this sort was mated with generations of various procreations, such as orcs, men, and ents. Thereafter, they were largely left on their own until Sauron in the Third Age bred and sustained the Olog-Hai.
This synthesis, perhaps, allows for all of the known data and seems to explain both the common origin of trolls in general and the special origin of the stone trolls in particular.
However, there seems to be insufficient data to form any final conclusion about the origin of trolls, and Tolkien himself seems not to have finally settled on one, at least in print.
There is one other possibility concerning the origin of trolls...
In the late 20th Century of the Common Era of the Last Age, some last monstrous throwback of the offspring of Ungoliant unleashed upon the unsuspecting multitudes a net that ensnared them for many hours of nearly every day of their lives. It was called, the World Wide Web.
The hapless victims were lured in, and in darksome chatrooms and even darker forums, there lurked hideous creatures that lay in wait. These "TROLLS," as they came to be called, would pounce upon their prey, bludgeoning them with weighty posts in unstoppable assaults while the victim writhed in endless sticky threads. All who blundered into their lairs regretted it...
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