Mrs. Tentacles (or Mama Tentacles) is Squidward's mom. She is voiced by Rodger Bumpass who voices Squidward as well.
She has white hair and wears a dress. She wears slippers, gold earrings, and she is turquoise, just like Squidward. In the episode "Fools in April," she had white hair, but she has no wrinkles. In the episode "Krusty Towers," Mama Tentacles has wrinkles, pink clothes, and looks older, but also wears glasses.
Mrs. Tentacles seems to like baking cookies as seen in the episode "Krusty Towers." She also appears to be very friendly, although in "Fools in April" she was mean to Squidward but that was merely a haullucination. She is married to Papa Tentacles although it is presumed that they are divorced from each other as she appears to live alone and Papa Tentacles is shown to be alive in Hooray for Dads!
Mrs. Tentacles also resides in an Easter Island head similar to Squidward's; the only difference is that her home has womanish curly hair as seen in the episode "Krusty Towers."
She made her first live appearance in the episode "Krusty Towers," because Squidward wanted cookies like his mother used to make. After Squidward gets his mother's cookies, Squidward replies "If only Mom was a better cook."
She made a small appearance in "Ghost Host" when the Flying Dutchman took the form of her head to haunt Squidward by repeatedly saying the same phrase over and over as a way of torture to Squidward.