You can thaw the f/t prey in a baggie in warm water, then hit it with a blowdryer after it's thawed to heat up the skin and make it seem more alive. If you aren't already, you can also use the tongs to make the mouse 'dance'. If you end up deciding to feed live, just remember to supervise the feeding (and probably be ready with a pencil or tongs or something to put in the prey's mouth if it starts biting your BP).