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You did not indicate how long you've had your dwarf plants however, I highly recommend dividing. These plants are low-low maintenance -every year I let the plants be then trim them way down and pull off dead growth as soon as last frost is gone. The plants seem to really thrive from this and come back with beautiful new fronds each year. I have had to divide a plant or two and there are several detailed instructions online on how to do this.

I am puzzled about your question. Generally, these plants are quite hardy in your region, as they're warm-season grasses and Florida rarely suffers from too many harsh winters. Are you certain they are dead. Perhaps your fountain grass is still dormant. They typically emerge in late spring to early summer.

Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/foliage/fountain-grass/tips-for-care-of-fountain-grass.htm

Ornamental grasses typically do not require fertilizer for lush, healthy growth. However, if you do choose to apply fertilizer, organic fertilizers (well-rotted manure, leaf mold, etc.) are excellent for ornamental grasses, as these release their nutrients slowly. If you don’t have easy access to any of these, you can simply purchase a bag of organic fertilizer for lawns.

This winter was particularly cold for most of the US. It is possible that it simply got too cold. Another possibility is that if the area it is growing in is too wet, it cannot tolerate that over the winter. Here is an article to help you determine if it is dead or just on a slow start:
https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm

This is a warm-season grass and typically thrives in warmer temps—they require patience, as they’re slow to get growing but begin greening up by late spring/early summer.

This cold has damaged many plants this year, so it is possible that they did not make it due to the unusual cold. This article will help you determine if they are dead or not:
https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm

I would give them another two weeks, but if you do not see anything by then, they are likely dead.