Vocalion's 1937 Hot Springs session did record a couple of Shreveport-area blues singers, Three-Fifteen and his Squares and Tommy Settles. The latter also recorded for Paramount.
Are you referring to "Jazzbo" Tommy Settlers, or is there a separate blues singer named Tommy Settles?
Yes, same person. His name is spelled differently on Paramount's releases but it's the same artist. Plays a kazoo.