Sounds like a frequency but the word frequency is too predictable, IDK. So much to learn! One can dream.
Discussion
Essentially, it is. But each phonon represents a different frequency.
When the structure vibrates, it does so at a seemingly chaotic series of frequencies at the same time. (Multiple, interacting phonons)
A note of difference between photons and phonons-
Phonons of different wavelengths interact and mix with each other, unlike photons that generally do not.