Pony palm froze, foliage is white

Question

Bolus is still healthy

Answer 1

Since it is too cold outside for it, go ahead and bring it indoors unless you think it is too large to manage. In that case, leave as is till winter is over, but if another frost is predicted, cover the plant to protect it.
Once the danger of frost has passed, cut the damaged leaves off to the base. If the bulb did not sustain too much damage in the freeze, it should regrow from the bulb.
https://www.gardeningknowhow.com/houseplants/ponytail-palm/ponytail-palms-outside.htm

https://www.gardeningknowhow.com/houseplants/ponytail-palm/ponytail-palm-care.htm