crock Published February 10, 2012 at 397 × 480 in Winter Storage: Kimchi and Lacto-fermented Green Tomatoes This is one of my fermenting crocks. I have about five different types and sizes. You can pick up crocks at garage sales or buy them new. This is one of my fermenting crocks. I have about five different types and sizes. You can pick up crocks at garage sales or buy them new.