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Yes, this is probably frost damage as you've mentioned. But it looks like there are still some healthy leaves, and the middle of the plant and the roots are probably undamaged. The best option is to let the plant recover on its own- cutting damaged leaves off is not necessary. Be sure not to overwater it while it's recovering, because damaged plants often use less water. Removing any flower buds that grow may help the plant focus its energy on growing new leaves.

This can happen sometimes, but it might be that they are getting too much light. You can try moving them into a little more shade, and they should stretch out. This is no problem though. It is actually healthy. Here is an article for more information on the plant: https://www.gardeningknowhow.com/ornamental/flowers/clivia/clivia-plant.htm

Clivias are not annuals and they do not have a true dormant period. They need protection from freezing temps and they should be allowed to get drier than normal during the winter months, but not enough that the leaves dies back or even will.

Apparently, yours did get unusually dry. It is hard to know how much damage was done to the roots. Remove all of the dead leaves, but do not cut the main stem or repot the Clivia. Do saturate the rootball initially and keep it close to a north window. Be patient and look for signs of healthy new growth that will signal that it is recovering. Good luck with it!

You can remove any seeds that form if you prefer, but you do not have to.

Allow the stem to die down naturally.

https://www.gardeningknowhow.com/ornamental/flowers/clivia/clivia-plant.htm

It may help, but keep it out of direct sun for awhile so that it can recover. This article will give you more information on their care: https://www.gardeningknowhow.com/ornamental/flowers/clivia/clivia-plant.htm

This article will help you.

https://www.gardeningknowhow.com/ornamental/flowers/clivia/clivia-seed-germination.htm