No. Much more common than you think. Special variety.
Chinese Empress, (Paulonia) is about the same thing as a catalpa tree. BIG leaves, not pinnately compound. I never heard of a foxglove tree.
EDIT: Ha! A foxglove is just a synonym of the Chinese Empress. BTW: I have an "Empress" tree down the road from my shop. They are rather pretty when in flower, but they suffer from too much winter kill in our area. I have found them at other locations, but they are only stumps that keep sprouting new suckers. The stem dies each winter.
They have been promoted in mail order catalogs as beautiful, rapid growing trees to unsuspecting homeowners that didn't really know what they were buying. These trees are weak limbed, they can grow invasively from all the germinated seeds, they are a pretty messy tree, and they simply don't survive too far north. The mail order catalogs always seem to forget that little problem.
The tree I posted above has a few special problems, too. If you look real close, you will see them. You may not spot the thorns, but they are not important to the ID.