Mother Goose (or Dr. Goose) is a character occasionally referenced in the Shrek series. She is well-known as a fictitious keeper of fairytales and nursery rhymes, often being associated with the latter.
While not physically appearing, she is seen as a statue in Mother Goose Land-- a peaceful village named after her likeness.
She appears on the front cover of her book "Once Upon a Time Out!", going by Dr. Goose.
She is mentioned by Donkey as an "angry bird" after seeing her overact a reading of "Sleeping Beauty".