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Mr. Krabs' Grandma is Mr. Krabs' grandmother and either Grandpa Redbeard's wife or Betsy Krabs' mother. She only appears in a picture in Mr. Krabs' wallet in the episode "The Sewers of Bikini Bottom."
She is a pale red, wrinkled crab with gray hair and skintags. She has no teeth, and wears dentures made out of cardboard.
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She may have married Redbeard Krabs. If she did, then the two had Mr. Krabs' father together. If she did not marry Redbeard, then she had Betsy Krabs.
At some point, most likely, in her old age, she gained a pair of false teeth that were made out of cardboard.