The Collaborative International Dictionary of English v.0.48:

Frenchify \French"i*fy\, v. t. [imp. & p. p. Frenchified; p.
   pr. & vb. n. Frenchifying.] [French + -fy.]
   To make French; to infect or imbue with the manners or tastes
   of the French; to Gallicize. --Burke.
   [1913 Webster]