* Titan of course has a dense atmosphere.
* Triton has a thin nitrogen atmosphere. However, is dense enoug to be visible. Even some clouds have been seen there.
* Io has a very thin sulphur atmosphere due to volcanic activity.
* Europa, Ganymede and Callisto (?) have extremely thin oxygen atmosphere created by micrometeors striking on surface ice.
* Enceladus has the transient atmosphere already described.

The atmospheres of the Galilean satellites are actually quite good vacuums.

Charon does not have measurable atmosphere. If it had, it should have been detected during the recent stellar occultation.

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Science is a way of trying not to fool yourself. The first principle is that you must not fool yourself, and you are the easiest person to fool.
-- Richard Feynman