Comets contain ice.
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No, comets and meteors are not considered to be small planets. Comets are simply considered to be comets, and meteors are simply considered to be meteors. (Meteors are asteroids that have entered the atmosphere.)
No. They do not have enough gravity to hold on to the gasses.
Because they do not have volatiles in them to form a coma as to comets.
Many comets and many asteroids are named, though not all, particulary not all asteroids. As for meteors, as they happen in an instant when a piece of ice, dust, dirt or rock enters the Earth's atmosphere and burns up and then they are gone, they are not named.