SMPS load frequency to switching frequency
If the frequency of the load exceeds the SMPS switching frequency, what are the results?

If what you mean is the frequency of current drawn by the load...
Like any regulator, your SMPS controls its output impedance via feedback up to a certain frequency that is lower than the switching frequency. How much lower depends on the design. Above that, its output impedance is determined by the output capacitors.
So the regulator/SMPS handles the load current up to the frequency where output caps take over.