Yes, an accelerating proton, just like an accelerating electron or any other charged particle, does produce an electromagnetic wave. This phenomenon is described by Maxwell's equations, which are a set of fundamental equations that govern the behavior of electric and magnetic fields.
When a charged particle accelerates, it experiences changes in its velocity, and this change in velocity produces a changing electric field around the particle. A changing electric field, in turn, generates a changing magnetic field, and these changing electric and magnetic fields propagate outward as an electromagnetic wave.
The characteristics of the electromagnetic wave produced by an accelerating charged particle, such as its frequency and intensity, depend on the properties of the acceleration and the motion of the particle. For example, if the acceleration of the charged particle is oscillatory, it will generate an electromagnetic wave with a corresponding frequency.
It's worth noting that the acceleration of protons, as well as other charged particles, is involved in various physical processes, including particle accelerators, certain types of radiation, and astrophysical phenomena. In these cases, the emission of electromagnetic waves by accelerated protons can have important consequences for understanding and studying the associated phenomena.