I have certainly never heard of such a beast. My ham radio HT can receive FRS and CB at the same time. The problem is that the frequencies are so far apart it would be difficult to design an antenna that would work well on both bands.

I also believe that getting approval from the FCC for such a radio would be difficult at best. So I am almost 100% certain that none exists, and I place very small odds that any will exist in the future.