Podiatry, by itself, like medicine, pharmacy, optometry, is largely a standalone graduate doctoral program. Podiatrists aren't trained by attending medical school first then into a podiatry specialty. You apply to podiatry school to be a podiatrist. You apply to medicine to be a physician, then you specialized in the different areas of medicine. Get how that works?
There can be specialties in podiatry. But, podiatry, like medicine/pharmacy/optometry, is a standalone degree with a different doctoral degree granted at the end of the 4 years of school. Thus, the word podiatry, by itself, is not a specialty.