Is it normal with a sprained knee for my leg to be swollen, my toes to be tingly and my knee to keep popping?

Yes: If your knee is swollen, gravity will bring some of the fluid down to the foot causing your symptoms. Fluid can also make the knee pop.

Many possibilities: Your pain could be as a result of many different things. A thorough history and physical exam and possibly some laboratory and radiology exams are needed to determine the exact cause. Causes of pain may include: trauma (fracture, sprain, arthritis), infection, metabolic conditions (gout), musculoskeletal or biomechanical abnormality and neurologic conditions (neuropathy).