Which current sporting legend is nicknamed 'black mamba'?
Yes, the word 'sporting' is a gerund, the present participle of the verb 'to sport' that functions as a noun. The present participle of the verb also functions as an adjective. Examples: When he finished the fight he was sporting a black eye and a smile. (verb) We have a sporting chance to win the prize. (adjective) The kids are always excited by an opportunity for sporting. (noun)
I think no. More The reverse side of the current $2 bill is an interpretation of John Trumbull's painting of the the signing of the Declaration of Independence, but no black persons participated in the ceremony. The urban legend about a black man appearing on the bill stems from how shading on the original painting translated to the printer's engraving.
I believe that there is a legend about the person who can ride the Black Shark. The Black Shark apparently lives in the coast off Australia, and the person who can ride the Black Shark, can control it, and the Black Shark will be the person's friend. This is just another interesting myth, I advise anyone out there not to go off trying to ride sharks.