What is the name of this landform?
This is a large glacier calving event. Calving occur at the front of the glacier, probably a very wet (and likely warm based) glacier where a considerable amount of water is flowing out of the system (thus from the glacier to the sea). The amount of water is important as it can accelerate the ice flow speed on the valley floor, enabling the breaking of big ice chunks along the way. This is what typical calving events looks like: https://pubs.usgs.gov/of/2004/1216/c/images/calving1.gif

When the glacier ice is moving fast in a valley, and encounter hard rock outcrops on the valley floor followed by sudden drops in topography the ice will break, making it what is known as an ice fall: https://pubs.usgs.gov/of/2004/1216/i/images/icefall1.gif , or if the topography is moderate, seracs instead https://pubs.usgs.gov/of/2004/1216/s/images/serac1.gif .

But typical events of normal glacier dynamics as aforementioned does only answer a part of the question. What happened in these picture is that the glacier chunks went seaborne, in a fjord, after a big calving event. The fjord prevent the glacier fragments to spread, forcing these to move along the fjord. This next picture as reported by ABC news show a big calving event that happened in Greenland in 2018, similar to the picture you are showing:



(Source and caption: Tabular icebergs float in the Sermilik Fjord after a large calving event at the Helheim glacier near Tasiilaq, Greenland, June 23, 2018. Source: ABC News https://abcnews.go.com/International/watch-billions-tons-ice-collapse-climate-change-impacting/story?id=57972318)

Here we see the perspective of the rock walls on both sides preventing the spreading and concentrating the glacier chunks.