frost hit my ficus shubs and wondered if anyone knew how to save them...

I assume you reside in a southern locale and the frost hitting your ficus is not a regular feature of your climate.
Since this has not been a prolonged time of frost, chances are your plants have not been adversely affected.
Try to prevent any further frost attaching itself by either covering with sheets, or pile leaves over them, bringing mulch up around the base of the plant...or earth...or cover the plant entirely with ...
a picnic hamper, a garbage can, a bushell basket...anything that can prevent frost from contacting and staying around on the plant.

A wafting breeeze is enough to prevent frost not touching down...a slight breeze is better.
Water your plants to prevent the roots drying out and a slight misting over the leaves can bring up their temperatures.
A wrapping of burlap can also protect them.