I had my wisdom teeth removed. is it possible for any more of my teeth to become any more crowded/crooked?

Sure: Depends how crowded they are to begin with.

Yes: Depending on your age and other factors, some people may experience some crowding or shifting of teeth after the wisdom teeth have been removed.

Crooked teeth: Yes, but not because of the wisdom teeth being removed. Your teeth will always want to shift and move. There are lengthy biological reasons why. Suffice it to say that if you're happy where your teeth are at, then it's best to retain them in their position with a retainer. If your not happy with how they look, seek out an orthodontist to straighten them first and then retain them afterwards.

Possible: It depends of the size of your jaw, number of missing teeth present and how crowded your teeth are.

Yes: Crowding is unfortunately a normal process of aging - a small amount throughout life. Teeth will not spontaneously move backwards, resolving crowding when wisdom teeth are removed. They didn't contribute to the crowding in the first place.

Yes: The poor wisdom teeth get blamed for things that are happening in the mouth for other reason. They contribute perhaps 10% to the "crowding" picture. Your "bite" will change throughout your life, so you can expect changes (which can be minimized with good dental care and with retainers if you've had braces). Teeth don't uncrowd spontaneously, so if you have a problem see orthodontist.