Volcanic peaks that are below sea level but rise more than 1 kilometer above the deep-ocean floor and have a pointy top like an upside-down ice cream cone are called

Seamounts

Explanation:

According to my research on studies conducted by various geologists, I can say that based on the information provided within the question the term being described are called Seamounts. This term (like mentioned in the question) are underwater mountains that rise hundreds or thousands of feet from the seafloor. They are believed to be extinct volcanoes that created piles of lava when they were active.

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