"Biff Rose"! A name out of my foolish youth, when my parents bought "The Thorn in Mrs. Rose's Side". His song "Molly"

When I was a young man, I ran away from home and went to join the circus
I went to join the cotton candy world and make me lots of money, On my own
For Molly, ah, my pretty Molly, well, she's waiting all alone
Someday soon I will return to her...

still makes me sniffle sentimentally. Where did he come from, and whatever became of him?