Q.Split Leaf Philodendron
I have two large split leaf philodendrons that are about 5 years old and have been very healthy, but the foliage froze in our bad freeze this year (Austin, TX). I have pulled the stems from the main stalk, which feels like it is waterlogged in about the top third of the stalk. The stalk is about 5 inches in diameter at the base. Should I cut these back at the ‘drier’ point or leave them alone? Do you think they survived, or should I replace them?

Certified GKH Gardening Expert
Any part of the stem that feels "mushy" is dead and does need to be pruned. Stems that are still firm will regrow leaves. And it will regrow if the roots survived. These articles will help you as well:
https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm
https://www.gardeningknowhow.com/plant-problems/environmental/tips-for-saving-cold-damaged-plants.htm