I found these slightly bawdy cocktail napkins at an estate sale a few weeks ago. They're similar to the Chuckle Naps I blogged about here.
They are called "Fractured French" and are actually reprints from a book of the same name written by Fred Pearson 2nd and illustrated by New Yorker magazine artist Richard Taylor. They are from 1950.
Each gag is a silly re-interpretation of a French phrase. You have to sound them out phonetically to get the joke.