If I had any doubt that the mango fad continues to march ahead unabated in Japan, the choice of mango ice cream for a Haagen Dazs crispy sandwich proves that fact. In fact, I'm starting to wonder if mango is going to join tiramisu as one of those fads that never fades away and remains in the mainstream for decades. I can't say that it would surprise me since mango is, of course, pretty awesome. However, I was not a fan of this line of ice cream sandwiches in Japan. The "crispy" shell in my experience took on moisture form the ice cream and lost some of its snap. It was also fairly brittle and tended to flake and crumble more than a conventional ice cream sandwich.
Beyond that, I made my own mango "ice cream" by buying bags of frozen mango pieces from "Lawson 100" (100 yen per bag) and adding a little milk to it and blending it in a Magic Bullet or food processor. You can't really get more "mango" than that. Sorry, Haagen Dazs.