No, it is not appropriate for a visitor to come into your home and start opening your freezer or searching your house without your permission. Such behavior is a violation of personal boundaries and privacy. It is generally expected that visitors respect the privacy of your home and refrain from accessing your personal belongings or areas without your invitation or explicit consent.
If you find yourself in a situation where a visitor is behaving inappropriately by searching through your belongings without permission, it is important to communicate your discomfort and establish clear boundaries. You can kindly ask them to refrain from accessing certain areas or explain that their behavior is not acceptable. If the issue persists or makes you feel unsafe, you may need to ask the visitor to leave or seek assistance from relevant authorities if necessary.