(edited) You are right, you asked a simple question and we ended up lecturing you. Those are not jazz chords per se (jazz sometimes implies extensions - not just the number of strings or position of the chord). More than likely, the chords you are talking about are sections of barre chords. There are 5 barre chord positions. The standard ones are E and A, but there exist C, G, and D. They're harder to finger and a lot of people just take 3-4 notes of these harder forms because they're easier to finger and switch between. I would suggest that a better way to think of them is "C in D (barre) form"