Of course, if you want to be really literal in the mint/chocolate smell, Demeter makes a Junior Mints fragrance. I am also a big mint candy fan and have a sample of Junior Mints, and honestly, it's not bad. It doesn't last long, but is very realistic.
As far as mint fragrances go though, I've also yet to find the perfect one for me. I actually would love to find a vanilla/mint scent similar to gum, mint ice cream, or candy. However, most suggestions are more towards natural mint leaf. I don't care for Roadster (too much earthy sour vetiver/labdanum), Menthe Fraiche (like the top, but hate the odd syrupy/mate' note in the drydown). I wish someone would make a fragrance that smells like sweet mint gum up top with a powdery,woody, vanilla base. Le Male is kinda in that vein, but I would like a stronger, more candied mint, and less of the barbershop lavender vibe. Anyway, maybe Demeter will create a Wrigleys Peppermint, Spearmint, or Doublemint gum scent. I'd certainly buy it!