Hydrogen atoms are not called "protons"; rather, "proton" is the specific name given to one of the fundamental particles that make up the atom.
An atom of hydrogen consists of a single proton in its nucleus and an electron orbiting around the nucleus. The proton is a subatomic particle with a positive electrical charge. It is one of the building blocks of matter, along with neutrons (which have no electrical charge) and electrons (which have a negative electrical charge). Protons and neutrons are collectively known as nucleons, as they are found in the nucleus of an atom.
The term "proton" comes from the Greek word "proton" meaning "first." This name was given to the particle because it was the first subatomic particle to be discovered and identified as a fundamental component of the atomic nucleus.
In summary, hydrogen atoms consist of a single proton in their nuclei, but the term "proton" itself refers to the subatomic particle rather than the entire atom.