Also known as Tilegram, Hexmap Cartogram.

A Hex Cartogram is a variation of the Mosaic Cartogram that uses hexagonal tiles instead of squares to make up the geographical regions. In a Hex Cartogram, each hexagonal tile represents a nominal unit from a particular variable (e.g. 1 hexagon = 1 million people). Hence, the number of hexagonal tiles assigned to a region is proportional to the data value assigned to that region.

Colours can be assigned to the hexagonal tiles in a Hex Cartogram to distinguish geographical regions, represent categories, or visualise an additional numerical variable.

The hexagonal tiles in a Hex Cartogram are arranged to give a rough approximation of the original shape and relative position of the geographical regions while preserving recognisable features like peninsulas or islands to aid recognition.

Tools that can generate Hex Cartograms:
Arcgis
d3-hexjson (D3.js)
Flourish
HexJSON HTMLWidget for R
Open Innovations (has a list of different solutions)
ONSgeo/HexMapping (Python)
TILEGRAMS by Pitch Interactive