cumshaw vs proffer

cumshaw

verb
  • To give or make a present to. 

noun
  • A gratuity or tip as thanks for a service 

proffer

verb
  • To offer for acceptance; to propose to give; to make a tender of. 

noun
  • An offer made; something proposed for acceptance by another; a tender. 

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