tagati vs witch doctor

tagati

noun
  • In South African English, a wizard, witch, or a spiteful person who operates in secret to harm others or who uses poisons and familiar spirits to carry out harmful deeds. 

witch doctor

noun
  • A person (often male) who is believed to ward off witchcraft and heal through magical powers; a shaman. 

How often have the words tagati and witch doctor occurred in a corpus of books? (source: Google Ngram Viewer )