desert boot vs jackboot

desert boot

noun
  • A type of laced ankle-high boots made of soft suede with a crepe sole 

jackboot

noun
  • A glossy leather calf-covering military boot, commonly associated with German soldiers of the WWII era. 

  • The spirit that motivates a totalitarian or overly militaristic regime or policy. 

verb
  • To march in jackboots. 

  • To stamp on with a jackboot. 

How often have the words desert boot and jackboot occurred in a corpus of books? (source: Google Ngram Viewer )