Who's This? He's the (apparently) Native character on page 10 in Who's Who vol. XX, drawn by his first inker, George Evans.
How you could have heard of him: James Robinson notably used him as part of Opal City's history in Starman, and presented the idea that one of the O'Dares was Brian Savage reincarnated (and so might Star Boy). He also established Scalphunter's legacy by making Balloon Buster Steve Savage his son (third in the line of heroes, since Matt Savage - Trail Boss was Brian's father). Scalphunter also appeared in The Kents, and was a most recently a Black Lantern in a special revival of Weird Western Tales (#71). Brian Savage has also made appearance all over the modern DCU, in Superman/Batman, Guy Gardner Warrior and the most recent Jonah Hex series.
Example story: Weird Western Tales #69-70 (1980) by Gerry Conway, Dick Ayers and Romeo Tanghal
Gerry Conway wasn't the first to chronicle Scalphunter's adventures, but he was the last to do so regularly and, as often happens with stoic, silent heroes, the stories were accompanied by a novelist's narration, not too purple, I think. Just right. Fleisher wrote the feature less internally until issue #44, so I'd say Conway left more of a stamp on the character.
Who else? Volume 21 of Who's Who awaits and it is CHOCK FULL of obscure characters. How about we start with a villain?