Turk vs double Dutch

Turk

noun
  • A member of a Mestee group in South Carolina. 

  • A Turkish horse. 

  • The plum curculio. 

  • A person from Turkey or of Turkish ethnic descent. 

  • A person from Llanelli, Wales. 

  • a Christian horse-archer in Crusader army (Turcopole). 

  • A speaker of the various Turkic languages. 

name
  • A surname. 

adj
  • Synonym of Turkish 

  • Synonym of Turkic 

double Dutch

noun
  • A game of jump rope with two ropes and frequently two jumpers. 

  • A language game akin to pig Latin. 

  • Incomprehensible language. 

  • Sex using a condom and the contraceptive pill at the same time. 

How often have the words Turk and double Dutch occurred in a corpus of books? (source: Google Ngram Viewer )