You have been missing your dad very much. I understand as I lost my dad just a few years ago and I missed him terribly and still do.
In your dream you dad came to you to let you know that he is still with you and you can talk to him at any time and he will hear. He also wanted you to know that while you can talk and he can listen, he can't be with you.
Hugging him adn kissing him - being with him.
Frozen - can't see him or touch him.
It was wonderful of your dad to let you know that he is near. Just enjoy his presence adn know that we don't have to see someone or touch them to enjoy them.
Paul