Here are some possibilities for what you might be looking for:
* Herbalist: This is a common term for someone who studies and uses herbs for medicinal or culinary purposes. They may have formal training or learn through apprenticeship.
* Botanist: This is a scientist who studies plants, including their classification, structure, and function.
* Ethnobotanist: This is a specialist who studies the relationship between plants and people, including the traditional uses of plants in different cultures.
* Pharmacologist: This is a scientist who studies the effects of drugs (including plant-derived ones) on the body.
If you can provide more context about where you encountered the term "herbatologist," I may be able to give you a more precise answer.