Yes. You can switch the speed of your fans via your BIOS, use a program like Speedfan (easier) or use a piece of hardware that u can install in front or back of the case with little knobs.
Either way, u can control the speed of them. Turning them off is probably not recommended, it can overheat the cpu pretty fast if the fans are not enough or not spinning fast enough.
You can find multiple video tutorials on how to do it, just google it and you'll find easy answers