A person who studies medicine specifically for sports is typically called a sports medicine physician or sports medicine specialist. These professionals focus on diagnosing, treating, and preventing injuries related to athletic activities and often work with athletes to enhance their performance and overall health. They may also engage in research and education related to sports injuries and rehabilitation.
A Ph.d is a doctorate. A person with the letters Ph.d after their name is called a Doctor, even if they did not study medicine.
People who study medicine are called medical students or medical professionals, depending on their level of training.
I guess you can call that person an athlete.
Smart person
Micrologist
Astronomer
What is the study of codes
PHILOSOPHER
An astronomer
A person who sells herbs to be used as medicine is typically called an herbalist or a herbal practitioner.
I think you call it a medicine tester
linguist