Fish Singer
From Muppet Wiki
There's lots of fish in the sea.
The Fish Singer first appeared in the opening number of episode 413 of The Muppet Show, singing "Blue Fish Blues" with the Gills Brothers.
She was later seen in one episode of The Ghost of Faffner Hall which also included various background characters from The Muppet Show and Fraggle Rock, and showed up many years later as an assistant to the king (played by the Hypocritic Oaf) in the story of "The Hat Sharpener" in episode 103 of The Jim Henson Hour.
