Are there any African American LEGO minifigures besides the ones from the "Sports" basketball series?
There are a few on Bricklink, if you search by part colour:

 3626bpb212 

 3626bpb159 

 3626bpb749 

 3626bpb424 

 3626bpb214 

 3626bpb573 

 3626cpb1088

 3626cpb1124

 3626cpb1067

 3626cpb0906

 And the standard smiley is also available.

If you search for the older Brown colour (instead of the current Reddish Brown) you find that there are basically only the very rare Lando head, as well as the old NBA heads.