Yes, you can attach a flip screen to a camera. This is typically done with an aftermarket accessory, as most cameras do not come with a built-in flip screen. There are a few different types of flip screens available on the market, so you'll need to choose the one that best suits your needs.
The first type of flip screen is an articulated LCD screen. This type of screen is attached to the camera via hinges, and can be flipped out from the camera body. This is a great option if you want to be able to see yourself while taking selfies or vlogging. Articulated LCD screens typically have touch functionality, so you can easily change settings or review your photos without taking your eye away from the viewfinder.
The second type of flip screen is a tiltable LCD screen. These screens are not attached to the camera body via hinges, but instead are mounted on a bracket that allows them to be tilted up or down. Tiltable LCD screens are great for taking low-angle shots or shooting over crowds. They usually don't have touch functionality, but they make up for it by being able to rotate 360 degrees.
No matter which type of flip screen you choose, attaching it to your camera will definitely improve your photography experience!