I can only come up with three-ish words for sea-ice. Although I do have many more concepts in my mind
Ice, iceberg, floating ice..
The fascinating this is when I learned that what you can communicate influences how you see and experience the world. Language has always fascinated me in that way
I do know more _concepts_ for sea ice though!
Meters-thick ice plateaus safe to live on for years (where ice bears live and hunt and so on)
Watery slushy ice you can easily sail navigate through with a boat.
50-200cm thick ice you can't go through with a small boat, thick enough to walk on.
Small ice platforms floating on the water, technically thick enough to stand on but what's the point since it's maybe 2 meters in diameter?
There're probably many more types of ice worth having a concept and eventually even a word for. If hunting is important for you, and there's a specific formation/type of ice where sea-lions typically gather, it's great to have a word for that!
A lot of a people's culture and a lot of individual's personal experience is embedded in the language they speak.