I have read that these are perennials. Mine have been left outside (Oklahoma) this winter. They are in pots, will they come back in the spring? It has already been below freezing and faced frigid temperatures.
Polka Dot Plants
Certified GKH Gardening Expert
They don't usually survive temperatures that low for very long. They are perennials as houseplants, and where the temperature never gets below freezing. You will have to move them inside, and there is a possibility that they will recover.
This article will give you more information about the plant: https://www.gardeningknowhow.com/houseplants/polka-dot-plant/growing-polka-dot-plants.htm