Generally, creditors cannot sue someone after the bankruptcy has been filed. There is an automatic stay that stops any collection efforts once the case is filed. However, there are certain circumstances where a creditor may have rights to file an objection against the debtor in and during the bankruptcy. That type of action would have to be brought in the federal bankruptcy court. It would not be brought as a separate lawsuit in the state court.
Generally speaking, there are no debts that can be sued upon by a creditor outside of a bankruptcy. They would have to be brought within the bankruptcy.