Yes it can! It's an easy way to save some peak-of-harvest goodness for the winter months. I find freezing works best with tomatoes that have been confitted whole. Just remove any garlic cloves and use a slotted spoon to transfer the tomatoes to a freezer-safe container. Pour enough of the oil over them so they are just barely covered and seal the container. Tomato confit will keep for up to six months in your freezer, although they are best before the three month mark.