Preheat the oven to 350 degrees F (175 degrees C). Spray a jelly roll pan with nonstick cooking spray.

Press crescent roll dough into the prepared jelly roll pan to form a crust. Let stand 5 minutes. Pierce with a fork.

Bake in the preheated oven until dough is fully cooked and golden brown, about 10 minutes. Let cool completely.

Combine sour cream, cream cheese, ranch seasoning mix, dill, and garlic salt in a medium mixing bowl. Spread the cream cheese mixture on top of cooled crust. Arrange broccoli, radish, onion, bell pepper, carrot, and celery on top of the cream cheese mixture.

Cover and let chill, 1 to 2 hours. Cut chilled pizza into 16 squares to serve.