After three years, the fro-yo trend seems to have finally collapsed on itself. Crain’s notes that Red Mango and Berrywild are down to two stand-alone stores each, and others like YogurBerry are just plain goners. Nationally, fro-yo production is down 13.7 percent in the past year. Maybe health nuts are catching on to the fact that the stuff is loaded with sugar, as Gourmet Live pointed out last week? But hey, it ain’t all bad news: The Tribeca Citizen notices that organic brand Yorganic opened its Tribeca store on Greenwich between Warren and Murray Streets today. In case you wanted to make 31 degrees feel like 21!