I know of one yeshiva that censored a fourth grade mishna class. Although the mishna says one word, the Rebbi insisted on saying “Bayah sh’noldah byom tov” instead of the word written.
In Europe, where my father went to cheder, they translated “Isha Ke Sazria” as “ven a fro flaanced”. In yeshiva ketana they translated “Shtaar” as “a sherbel” (pottery fragment) – because “a kesubah iz a shtaar un a kesubah mer ken trachten fun frau’en”.