Are high-frequency gravitational waves inherently stronger/higher energy? Like the way gamma photons have more energy than radio photons? A simple yes or no would be helpful, but a brief explanation would be nice too.....
What about sound waves?  
 A: A graviton would have energy $\hbar \omega$, so indeed would have larger energy for larger frequency, like photons. This is just a feature of quantum mechanics, and is not “special” to any particular kind of particle. 
Of course, gravitons have never been observed. There is even work by Freeman Dyson and others that it may be fundamentally impossible to ever observe a single graviton. For example, if you tried to build a version of LIGO sensitive enough to see a graviton, the detector would need to pack so much energy into a small space that it would collapse into a black hole. 
For a classical gravitational wave (just like for light), there is nothing intrinsically more energetic about a wave with higher frequency. The energy is proportional to a combination of the frequency and amplitude of the wave. 
The same basic story is true for sound waves. Quanta of waves in a medium (phonons) have energy $\hbar\omega$ just like any other quanta. For classical sound waves the energy is a combination of amplitude and frequency. The only difference is that phonons have been observed, and there isn’t as much of a risk of collapsing into a black hole
