As the Long Island wine community has moved into adolescence, several smaller wineries have popped up on the Island — some focusing on a single style or even one wine. Sparkling Pointe, for instance, has released it’s first — you guessed it — sparkling wines. And, Medolla Vineyards, for now anyway, is making merlot. And then there is Croteaux Vineyards, a new producer owned by Michael and Paula S. Croteau. They focus solely on merlot-based rose wines, and they make three of them. While a new winery, Mr. Croteau is no stranger to Long Island wine scene. As creative director…