Toad doctor

Dr. Toad, (also referred to as Toad Doctor), is, as his name would imply, a Toad doctor. He first appears in Mario & Luigi: Superstar Saga, where he is trying to help Mario recover from Bean Fever in Little Fungitown. However, since he doesn't have the appropriate medicine, he sends Luigi on a quest to get Crabbie Grass from Guffawha Ruins.

Toad himself appears in the 1991 Club Nintendo comic "Süße Weihnachten" as a doctor. Here, he diagnoses Bowser's stomachache and assigns Dr. Mario to help him. Dr. Toad along with Nurse Toadstool serve as Dr. Mario's assistants as he performs a diagnosis of Bowser's health.

Another Toad doctor appears in Mario & Luigi: Partners in Time, where he is briefly seen tending to the fainted Toadsworth in the present Peach's Castle. Once again, this Toad doesn't have medicine and sends Mario to get a Refreshroom for Toadsworth.

There is yet another Toad doctor in Mario & Luigi: Bowser's Inside Story, and he is called Dr. Toadley.

Additionally, in The Adventures of Super Mario Bros. 3 there is a character named Mushroom Doctor; however, aside from their shared profession, he and Dr. Toad bear no resemblance to each other.