The frequency of light is a well defined concept, describing the electromagnetic spectrum . That light is a superposition of photons is also an experimental fact, as seen in this single photon double slit interference , where the interference pattern characteristic of the wave is built up one photon at a time.
In the quantum mechanical framework, the photon, as all elementary particles, has a probability to materialize at an $(x,y)$ of the screen, given by the $Ψ^*Ψ$ of its wavefunction, so the frequency must reside in the wavefunction of the photon, this is an example of the form :
Now write the complex wave function as a sum of real and imaginary parts $\overline E_T(\overline r)$ and $\overline B_T(\overline r)$,
$$
\overline{\psi}_T(\overline{r}, t) = 2^{-1/2}\left(\overline E_T(\overline r,t)+i \overline B_T(\overline r,t)\right)
$$
The published paper is here.
Superposition means the addition of the individual complex wave functions before taking the overall $Ψ^*Ψ$, and as the E and B fields are the same as in the classical equation, the frequency of light is built up by the probability distributions of the superposed photons.
Thus the association of the classical frequency of light with the $ν$ in the definition of the energy of the photon $E=hν$ is outlined
In this link it is outlined how the classical fields emerge from the quantum field theoretical framework.