From Muppet Wiki

Mama Fiama is Johnny Fiama's mother on Muppets Tonight. Johnny calls her "Ma." She makes a great pasta sauce -- so good that Martin Short can't help but eat so much in Episode 110 that he gets big as a house.

She also appears in Episode 210 and Episode 212.

A framed portrait of Mama Fiama was included with the Johnny Fiama Action Figure.