Yes, it's well taught that wavelength is related to frequency. Higher frequency is higher energy energy and lower frequency is lower energy, but it's the frequency of what? Unlike ocean waves, photons do not have a spacial amplitude. A photon does however have a spacial wavelength. This distinction between photonic wavelength and amplitude I've never heard explicitly addressed.
My understanding is that a photon's amplitude is the likelihood of interaction at a specific point in space. High amplitude is likely interaction, low amplitude is low likelihood of interaction. This means at a photon's peaks/crests it has high interaction and at its troughs the photon has low interaction likelihood. These likelihoods are repeated every wavelength, a length measurable in physical space.
This is some of the reason why an antenna for a given frequency range needs to be a specific size. Too small and there's a good chance of missing a signal. A proper sized antenna, related to wavelength, guarantees high interaction somewhere along the length of the antenna.
When speaking of many photons, amplitude (like AM radio) is simply flux, how many photons at a particular frequency exist during a given unit of time. That's not related to the amplitude of a single photon and not what I'm talking about here.