Hmm...
Don't have any of my old texts around, but I seem to remember the true resonant frequency of water is actually in the thousands of GHz (a couple terahertz). If memory serves, the reason that the 2.45 GHz frequency (microwave ovens in the U.S.) heat anything with water content is that it happens to be a harmonic of the full resonant wave.
I'm sure, given enough energy, just about any frequency would create some kind of heating. That much energy can't be absorbed by water or anything organic without something happening.
Again, it's been a couple of decades since I really delved into it and my soon-to-be 40 yr old memory may not be dredging up the proper information. Others with better info, please chime in now...
Brad