Process biscuits in food processor until finely crushed. Transfer to a large bowl.
Process Crown Mints in food processor until in very small pieces. Add to large bowl with the crushed biscuits.
Add Cocoa, Coconut and condensed milk and mix until well combined.
Divide mixture into three. Roll into logs 3-4 cms (1.5 inches) in diameter then roll in coconut. Wrap in baking paper and cling wrap. Refrigerate if using within the week or place in freezer until required. When needed slice into thick pieces for serving.