No. Icebergs are run-offs of glaciers, because glaciers are constantly moving. Water is constantly melting and re-freezing on glaciers, and water lubricates the bottom of the glacier causing it to move down the mountain or hill, etc. When glaciers move down into water, ice breaks off and becomes an iceberg, but it is just ice after it breaks off, no longer a moving object.
The main motive force for glacial movement is gravity. There may be some liquid water lubrication but it definitely does not cause the glacier to move.
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