There isn't one specific job title for a scientist who studies poo. However, the field of study is called Coprology.

Scientists who study poo could be:

* Microbiologists: They study the bacteria and other microorganisms living in feces.

* Gastroenterologists: They study the digestive system and can analyze stool samples to diagnose digestive issues.

* Parasitologists: They specialize in parasites and can identify parasitic infections through stool analysis.

* Environmental scientists: They study the impact of human waste on the environment.

So, while there's no official "poo scientist" title, many scientists work with feces in their research.