There aren't really names given for ice that has detached from an iceberg, because the iceberg itself has already detached from its parent ice sheet/shelf on land.
The wikipedia entry in the related link explains ice bergs, and gives a broad classification system by size and shape.
Iceberg or an ice sheet
A large detached piece of a glacier is called an iceberg. The process by which this happens is called calving.There isn't really a term for a detached piece of an iceberg. See related question.
You are probably thinking of an Iceberg, which can be a very large piece of floating ice.
kettle
Between 10 to 20 percent of an iceberg mass is above water. An iceberg is a massive piece of floating ice. Usually, approximately 80 to 90 percent of an iceberg is below sea level. A very large iceberg can be over 230 feet in height and over 738 feet in width.
Iceberg or an ice sheet
Iceberg or an ice sheet
That is an iceberg.
A large thick mass of ice that moves is an Iceberg.
That is the correct spelling of "iceberg" (floating ice mass, or type of lettuce).
An iceberg
A large detached piece of a glacier is called an iceberg. The process by which this happens is called calving.There isn't really a term for a detached piece of an iceberg. See related question.
icebergs
A floe (ice floe) is the term we often apply to a mass or small field of floating ice.
You are probably thinking of an Iceberg, which can be a very large piece of floating ice.
To damage the ship as it did, the iceberg was probably 50 times the mass of the ship or more, and iceberg ice can be too solid to shatter like ordinary ice.
kettle