https://duckduckgo.com/?q=frederick+douglass&t=h_&ia=images&iax=images
This is a painting of Wentworth Cheswell - b1746 - d1817 long before photography
Thanks for the clarification. I saw that picture pop up on image search and it seemed the most likely to be him based on the accurate period clothing, etc.
Funny thing. Two days ago I’d never heard of Wentworth Cheswell, and now I could probably write an auto-biography about him.