flim-flam vs whiff-whaff

flim-flam

noun
  • Misinformation; bunkum; false information presented as true. 

  • confidence game, con game 

whiff-whaff

noun
  • The breathy sound of something rushing quickly; whoosh. 

  • Unnecessary items or additions. 

How often have the words flim-flam and whiff-whaff occurred in a corpus of books? (source: Google Ngram Viewer )