No, it is not a good idea to freeze this fresh salsa, unless you are going to add it to a recipe that will be cooked. Frozen corn salsa will not taste good all by itself after thawing. The fresh vegetables you started out with won't be fresh, crisp, and crunchy anymore. Unfortunately, the vegetables and any fruits you added will be mushy, limp, and with no crispy crunch to them. But as mentioned before, it can be used in different ways such as adding it to hamburger soup with cabbage or tossing it over pot roast the last 10 minutes of cooking time.