How do fishbowl planets fit in here? Fishbowl planets are something along the lines of: the outer shell is ice, but possibly filled with water, meaning there m

How do fishbowl planets fit in here? Fishbowl planets are something along the lines of: the outer shell is ice, but possibly filled with water, meaning there might be intelligent life that developed and thriving inside the internal ocean, but would likely never have a way to contact us. But, can a fishbowl planet have underwater volcanos they could use as a heat source to forge tools needed to create more advanced technology? Or do ice ball planets not have a warm internal core?