Has anyone read great expectations?

in The Great Expectations is there a guy in the story named Muff POtter? because I read the book last summer and I do not remember there being a person named Muff Potter, but in my final exam review paper that I got from my teacher Muff Potter is listed as one of the characters we need to know, but I looked up the name on google but only Tom Sawyer came up, so maybe I think its a typo or something.

I read the book last year and im pretty sure that character was NOT in the book