Put a skirt steak in a plastic bag with a marinade and then promptly put it in the freezer. It has been in the freezer for a couple of days now. I want to thaw it out for dinner tonight, but I'm wondering if the meat has had a chance to marinate in its frozen state?
Marinating steak - apart from very acidic marinades - will affect only the outer few mm of your meat. While these are the first to freeze, they are also the first to thaw, together with the marinade.
Your total marinating time will be
(time until outer layer is frozen) + (time since outer layer thawed, before cooking)
Unless you flash-froze your meat and thaw in a microwave, this can be a few hours. In frozen state, marinating is basically stopped. So do the math, according to your desired total marinating time. You can always leave the meat thawing/marinating in the refrigerator for a bit longer, if neccesary.