they need 50-60F soil temps to sprout, a frost may have killed off whatever was sprouting below ground, if so, it depends on the size and strength of the bulb as to whether or not new growth will be initiated...you can dig them up, put them in pots and keep them indoors in warmth before planting them out again

Lisa - My elephant ears are just now beginning to emerge.
I am in southern Virginia. So be a little patient. Once they get going they move fast. JD

My Elephant Ears are just emerging but it looks like a couple didn't over-winter. I suspect the late frost is the problem. I'm going to give them a little more time before I dig 'em up and plant something else. I'm not sure what - I want "big & showy". any thoughts?

Try Xanthosoma wendlandii! It makes a suberb showing. They 'go dormant even here in Costa Rica for a few months during the dry season, but return with a bang!
My first one I found growing wild on our farm, and had no idead what it was.It has just reappeared, so it was small, but I liked the 'look' of it. I proceeded to collect some more. I don't think they are common here, as I have yet to find someone who knows what it is. The new leaves appear very quickly, and mine just started to shoot a couple of weeks ago with 3 leaves nearly three foot tall (and it's still in a pot))and a new one ready to open plus a 'bloom'.
You can't go wrong! I grow many differant alocasias and colocasias and this is 'special'.
Just add 2 , and 3 to the 'link for 2 more photos.

Here is a link that might be useful: