Answer:
Oreo is number 1 cookie in the US, and it has been that way for many years now. Nabisco (Oreo's producer) has a tendency to keep coming up with strange, sort of crazy flavors and variations, e.g. Fruit Punch, Jelly Donut, Peeps, Watermelon, Swedish Fish, Carrot Cake, Love Oreo, etc.
This new flavor frenzy started in 2012 with the Oreo Birthday Cake that was launched to celebrate Oreo's 100th birthday. Since it was a hit, Oreo's marketing department started coming up with more variations, some have been a hit, others haven't, but they will continue launching more and more strange cookies.