It's like saying sound produces sound: actually, particles move other particles, and this entire process is sound.
Huygens' principle talks about propagation, not "emission" in the conventional sense. The light is a wave in the electromagnetic field and the changing field at a point in space induces field in the surrounding space when time moves forward. That's the essence of Maxwell's equations. So... do you say that light emits light in order to move forward? Light is a continuous wave phenomenon (let's not get into quantum electrodynamics right now), it changes with time naturally, no need to call it emission.
It is somewhat misleading to say that, bacause light emitting light would mean something else: it would imply self-interaction, self-scattering of photons! Like in two crossing light beams producing light in other directions. That can happen, but only at frequencies so great that it induces particle-antiparticle pair production (~MeV energy is required for electron+positron pair).
When light propagates along the medium, you could say that the response of matter is actually repeated absorption and re-emission of light (polarization, leading to index of refraction and so on). But even in this context, it's unconventional to use this kind of language.