Mrs. Grumplestock

All info provided by http://adjl.wikia.com/wiki/Mrs._Grumplestock Mrs. Grumplestock (voiced by Mindy Sterling) is a fictional characters from animated series of Disney's American Dragon: Jake Long. She's an instructor at the Manhattan Genius Institute. Appeared in "A Befuddled Mind" is Season 2. She never make a reappearances afterwards.

Quotes

 * "Students, welcome to the Genius Institute"