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a kettle
Fail ice floe is another possibility.
comet
The initial depression can be created by a glacier and running water from the melting ice then becomes a river that will cut the area down to bedrock.
it is a comet it flies through outer space!!
A kettle lake would be the name. I believe Walden Pond is one famous example.
A kettle.
a kettle
A chunk of ice will float higher in water than an ice cube only if the ice chunk is larger than the ice cube.
kettle
In descending order of size: ice-sheet / -cap, glacier, iceberg, ice-floe, icicle, hailstone, snow-flake, frost crystal... water!
Kettles are formed when a piece of glacier ice breaks off and becomes buried by till or moraine deposits. Over time the ice melts, leaving a small depression in the land, filled with water.:-)
more ice? you need to be more specific in your question.
Glacciers
GlacierLarge masses of floating ice are called Icebergs. There are different types, but that is the general term applied to those large masses of ice.
Ice bergs.
Ice formed it.