If you have a bank deposit account with a bank that you owe money to on a credit card, yes they can do more than freeze the account, they can take the money out to satisfy their debt.
If the above is not the case, then if they get a court judgment against you, they can seek a court order to seize money from any bank accounts you have an interest in. It would be up to your joint account holder to establish entitlement to the funds to prevent seizure of the entire amount. This is going to depend in part on the laws of your state, so you should consult with an attorney in your area about the creditors' rights.
Mark J. Markus, Attorney at Law
Handling exclusively bankruptcy law cases in California since 1991.
http://www.bklaw.com/
bankruptcy blog: http://bklaw.com/bankruptcy-blog/
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