Are Chowder and The Adventures of Flapjack made by the same people.
Chowder and The Adventures of Flapjack are not created by the same person. Chowder was created by C.H. Greenblatt who had also participated in the making of SpongeBob SquarePants and The Grim Adventures of Billy and Mandy. The Adventures of Flapjack was created by Thurop Van Orman. Read more on http://en.wikipedia.org/wiki/The_Marvelous_Misadventures_of_Flapjack and http://en.wikipedia.org/wiki/Chowder_(TV_series).
Nope. If they were, that would be in the same drawing style.