I've made some similar to yours before but they didn't look as pretty and the idea of freezing the chocolate chips is genius! (makingthymeforhealth.com)
As a huge fan of frozen chocolate mousse cakes, I was wondering if this held up in the freezer, or was better left in the fridge. (biggirlssmallkitchen.com)
Finally, all you've got left to do is to freeze the chocolate mixture for at least an hour or until it is firm before eating. (dishbydish.net)