What does it mean if my project is frozen?

This means the end date you chose for the project has past. No freelancers can place any new bids, you must either pick a freelancer or extend the project.
Frozen project can be mean that you have pick the freelancer and the project is in awaiting approval from freelancer condition.

Related Topics:
How do I close my project, extend it, or pick a freelancer?
What if I don't know what programming language I want my script made in?
Can I re-open a closed project?
What is a budget range?
Can I change the information I provided about my project?
How do I open a new project?
Why do I have to choose the amount of days until my project needs to be done?