I personally, would not put hot water into a partially frozen Suburban WH. They are steel, but glass lined. Unsure of outcome, of hot water hitting the extreme cold glass lining.
I don't know how much ice is in there, but if hair drier worked earlier to melt, that's what I'd try. Then use suction hose to remove residual water in bottom that sits lower than the drain hole.
I'm sure many people don't get all the water out, with no damage come Spring, so leaving the ice in there may be okay. Your call, but I like removing all water, and reinstall anode back in opening to deter corrosion of threads and tank.
Jerry