Photons themselves are elementary particles and do not have subatomic particles within them. They are considered to be fundamental particles in the Standard Model of particle physics.
Photons are particles of light and electromagnetic radiation. They have no mass and carry energy and momentum. They do not have a substructure or internal components like protons, neutrons, or electrons, which are composite particles made up of smaller subatomic particles such as quarks and leptons.
Photons are considered to be quanta of the electromagnetic field and are described by quantum mechanics. They exhibit properties of both particles and waves, sometimes behaving like discrete particles and sometimes like waves depending on the experimental setup. They are also known to exhibit wave-particle duality, as demonstrated by phenomena like interference and diffraction.
So, in summary, photons themselves are not composed of subatomic particles. They are elementary particles and are the fundamental units of electromagnetic radiation.