Giant ice volcanoes has been identified on:

Nearly seven years after New Horizons visited Pluto, the little world is still revealing itself to be geologically complex. It has regions of terrain on its surface unlike anything else in the solar system. On March 29, 2022, scientists announced that giant ice volcanoes created some of Pluto’s most unusual surface features. Evidence suggests that this activity continued until quite recently, geologically speaking, and these ice volcanoes may even still be erupting today.