Dunkin’ Donuts, Canton, Mass., partnered with its sister brand Baskin-Robbins to launch two flavors of iced coffee — Mint Chocolate Chip and Old Fashioned Butter Pecan. The new flavors are inspired by the classic Baskin-Robbins ice cream and are sold in 12- 24- and 32-ounce sizes. Both iced coffee flavors are available this spring through summer at participating Dunkin’ Donuts restaurants nationwide.