I think you are getting quite the wrong idea... I mean sure you can, but it will be stressful as hell to make your literal first game on a jam, you shouldnt even make a full game first, as you will probably go over the scope and have a hard time implemeting your ideas, you should learn slowly by making prototypes and actually learning to use your engine of choice and its lenguage if you want to program, however its completely up to you, just dont give up on it if it seems too hard
If you mean: can you get a thing to move on screen in a game engine and set up a game loop? Yes, you can do that in a few hours with one or 2 tutorials. Even 20 hours is a lot.
If you mean: can you learn game development enough to make whatever you want? No
