Are you asking whether you would be able to fire the clay by burning a fire in the rocket stove/ tandoor oven? And are you talking about building a hybrid rocket/tandoor? The hybrid idea strikes me as interesting, not sure about how well it would work, but interesting.
Typically, pottery gets fired in a kiln - there are loads of different traditional and modern kilns for firing pottery. Some are electric, some propane fired, traditional versions have been
wood fired for centuries.
Doing a quick google search, I would expect to make a tandoor oven from terracotta and fire it at about 1,000, not 2,000. 2,000 is a firing temperature for porcelain/ceramic - china.