The term "Planck particle" is not a well-established concept in mainstream physics. The closest term related to the Planck scale is the "Planck particle," which refers to a hypothetical particle that would exist at energies near or at the Planck scale.
The Planck scale is the energy scale at which the effects of quantum gravity are expected to become significant. It is named after the physicist Max Planck. At this scale, both quantum mechanics and general relativity are expected to play a role, but our current understanding of physics breaks down. The Planck scale is extremely high energy, about 10^19 billion electron volts (GeV), or equivalently, about 10^28 times the energy achievable in the Large Hadron Collider.
Since our current theoretical framework is unable to describe physics at the Planck scale accurately, including the behavior of particles and spacetime, it is challenging to make definitive statements about the existence or properties of particles at that scale, such as the Planck particle. The nature of space, time, and particles at the Planck scale is a subject of ongoing research and remains an open question in theoretical physics.