Right now the best thing you can do is not much. The more you try to revive the plant the more stress its going to encounter. Nutes are stressful on a root system, but a big enough root system absorbs the shock to the betterment of the plant.
Frozen/very cold roots that have warm water poured over them are dead. Try freezing a glass and pouring warm water over it, the glass breaks, your outer roots definitely did not survive. I'd hope (and its very possible) that the inner root ball survived and is still trying to keep your plant alive. The tops are likely dying because the roots that are still living aren't big enough to feed the entire thing. Tried warm water on over a hundred different plants (flowers, veggies, herbs, etc) after a frost and every one of them died.
I'd stake the plants up/tie them up whatever and wait. Keeping the air dry will help if the top parts do not end up surviving, you'll probably be able to smoke them if the plant is far enough along. Don't spray, overwater, nothing. Just keep the soil at a safe level (moisture meter is a must for indoor imo, Idk your indoor exp), a steady happy environment is your only shot in my opinion.
Seriously best of luck man, pm me when you know how it comes out for sure willyah?