Hi There,
Yes, many, many times! Over twenty years, all various sizes, and shapes!
You can see these yourself at;
http://sohowww.nascom.nasa.gov
Look under "current images" of the Sun. As a "CAUTION", never look at the Sun, without the aid of professional solar viewing equipment!
Did you know some Sunspots can be many times larger than the Earth itself! Thanks for visiting Solar Week!