No. Freddie almost always (if not 100% of the time) sang the whole song in North America. Fans over here are much less apt to sing along than they are to cheer loudly and yell stupid things if the singer gives them an inch.
Freddie also sang the whole song himself frequently early on no matter where they went--it wasn't until the Stafford show on May 6, 1978, that he stopped singing and let the crowd have at it.