2:3 with Neptune (that is: two plutino orbits for every three Neptune orbits).

Plutino is one.

In order of size, smallest to largest, it could be a meteoriod, a defunct cometary nucleus, a comet, an asteroid, a planetesimal or a plutino.

It is a "Plutino" with a semi major axis of about 39.68 A.U.

Its orbit is very eccentric so its actual distance from the Sun varies a lot.

Anyway, its average distance will be about 3690 million miles.

It depends where and how big they are. It could be any of "planet", "minor planet", "moon", "asteroid", "comet", "plutino", "cubewano", or several other even more technical terms.