Are there any dinim of “muktzeh” on Chol HaMoed? Are there any poskim that speak about this?
No, halachos of muktzeh do not apply on Chol Ha-Moed, but to Shabbos and Yom Tov alone.
The only halachah of muktzeh that is relevant for Chol Ha-Mo’ed is the muktzeh of Sukkah decorations, which is a different type of muktzeh and involves the use of an item rather than merely moving it.
Best wishes, and sorry for the delay in replying.