Are my pomegranate trees dead?

We have four fruit trees: an apple, a fig, and two pomegranate. Both pomegranate trees were extremely productive last fall, but we acquired them in August when fruits were already starting to form, and didn't witness spring. The other two trees have grown in their leaves, bloomed, and now have the beginnings of fruit, but the pomegranate trees don't have leaves yet. Is this normal for pomegranate trees? Is there any way to check them for life? I'm a little concerned because they're such hot-weather plants and we had a nasty cold snap this winter (-15 F). Help!