You're probably thinking of Antarctica, but even there volcanic activity is having very little impact.

There are no active volcanoes in Greenland, and no underwater volcanoes for at least the past few million years.

There was a hot spot under Greenland, but that was millions of years ago (EDIT: there may in fact still be a hot spot that is cooling, regardless, a hot spot that's existed for millions of years can't explain why ice is melting now) and it has since moved to Iceland:

https://climate.nasa.gov/ask-nasa-climate/2982/fire-and-ice-why-volcanic-activity-is-not-melting-the-polar-ice-sheets/

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