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If there is any part of the plant still firm and green, you can save it. The parts that are mushy and black are a lost cause, but philodendron are very hardy and can come back if even the smallest part of them is undamaged.

Remove the blackened parts and see if you can find any green growth. Check the roots as well. If they are firm and white, they may also regrow the leaves.

Good luck!

There is not much you can do to repair freeze damage. But Philodendrons are resilient plants and can regrow damaged leaves easily.

As long as the stems on the plant are alive, you just need to give it some TLC until spring, when it will regrow leaves.

This article may help:
https://www.gardeningknowhow.com/plant-problems/environmental/tips-for-saving-cold-damaged-plants.htm

It is possible that the plant suffered winter burn, or the yellowing leaves could simply be part of the natural process where leaves die as the plant grows. Either way, you can trim off the yellowing foliage without harming the plant.

Brown spots on the leaves of philodendron are usually caused by disease pathogens which may be bacterial, viral, or fungus. This article tells you about the most common: https://www.gardeningknowhow.com/plant-problems/disease/bacterial-leaf-spot.htm

You'll probably have better luck regrowing new roots if you don't plant the whole thing. Cut it off 12 - 18" below the leaves, and bury the piece back into the soil. This article tells you more (I know the article is about "monstera," but the names are pretty much interchangeable, although technically they are 2 different species): https://www.gardeningknowhow.com/houseplants/swiss-cheese-plant/monstera-deliciosa-propagation.htm

I take it you've already cut the plants down? Treat the trunks as advised in this article for killing trees with herbicide and by cutting them down: https://www.gardeningknowhow.com/ornamental/trees/tgen/how-to-kill-a-tree-killing-trees-in-your-garden.htm