The Jovian moon Io is certainly volcanic, spewing volcanoes of sulfur into orbit!
Europa may have "ice volcanoes" caused by the cracking of the icy surface and exposing a liquid - possibly water! - in enormous plumes. This will take a lot more study to confirm. Ganymede _may_ have volcanoes; the math seems to predict them, but we haven't seen any yet. Ganymede does appear to have some sort of atmosphere, so it can't be ruled out.
Jupiters Moons
jupiters ice moon is Io
Jupiter's volcanic moon is called Io. It is the most geologically active body in the solar system, with over 400 active volcanoes due to intense tidal heating from Jupiter's gravitational pull. Io's surface is constantly changing due to the volcanic activity.
The moon Io is considered very active. It is one of Jupiters moons
Europa is Jupiters moon.
Jupiters moon is thought to contain microscopic ice crystals but this theory has not yet been proven
Jupiters moon Ganymede
Can
Jupiters biggest moon is Ganymede
Obviously not, Europa is a moon, not a star.
s/2003 sin
Me in July