Arlene: I saw your pics of your frozen plants. They look pretty bad.
I, too, kept the bad plants. One of my catts. lost several leaves and the buds - I'm now checking for soft spots as Cynthia suggested. The other catt. has 2 leaves that are very discolored but not mushy and I think it might make it.
The Den. has lost all leaves but 3, and they're on the way of dropping off. It still looks pretty bad, but there's a possibility that it may spurt some new growth in the future. I hope you'll be able to salvage some of yours. Good luck.