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Methane is a powerful greenhouse gas, and it's the main character of Titan's atmosphere, and still, Titan is extremely cold. (And Titan is closer to the sun then TNOs)
So I'm inclined to say that greenhouse-effect alone would not be enough to keep TNOs warm like Earth.
Additionally, Pluto has neither a strong gravity nor a magnetic field, nor tidal gravity from a parent planet.
It wouldn't be able to retain the atmosphere for long.