For tomatillos that require a pollinator, if I have only one tomatillo plant, but I root some cuttings from it, will the plants pollinate the other clones (and/or the parent)? They're all from the same plant, originally, and should be clones. So, I'm guessing they wouldn't pollinate each other well. Is this true?
Yeah, basically, cuttings are clones, so treat them as one plant when dealing with pollination. If the original plant couldn't self-pollinate, neither will the clones.