Cave trolls, as we all know, are tainted by Chaos. They regenerate, are often twisted almost like giant, powerful trollkin, and have oversized eyes.
And yet, most troll communities keep significant numbers of cave trolls. They definately are not considered “uz” but also not killed (unless they harm trolls), and are fed and provided shelter by their troll masters. They are usually treated as “work animals” – guard animals, tracking animals, or simple laborers.
One of the stranger practices that I have seen among so called “civilized trolls” is blinding cave trolls, and teaching them to hunt and attack by sound and smell. This allows them to travel during the daytime. In the Big Rubble, you often see patrols led by dark trolls and great trolls, with a dozen or so trollkin, and a cave troll or two snuffling around.