Frozen Food is often served to birds as a favourite. It is easy to serve up, convenient, lasts longer than fresh fruit & veg, the wastage is minimal. Most bought frozen veggies do contain sodium in the ingredients so read the packs before you buy them. They are also cooked or blanched & this alters the nutrient content. Raw is always best to serve to your parrots. As an alternative to buying frozen veggies you can cut large batches of fruit & veg up & simply freeze them in meal size portions, RAW. While cooked or blanched frozen food has alter nutrient content, freezed from raw fresh fruit & veg doesn’t change the nutrient content at all.
To know a little more about freezing bulk fresh fruit & veggies you can view the forums topic The Great Food Production Line