jackboot vs thigh boot

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. 

thigh boot

noun
  • A boot that rises as high as the wearer's thigh. 

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