A surgeo gave me 2 injections into knee scars of kenalog (triamcinolone) 1cc #10. 4 weeks apart. I developed pain since then, can this be from the kenalog (triamcinolone)?

Possibly. It is always possible that an injection could cause some pain, it really depends on where the pain is and what sort of scar was being injected. Oftentimes the pain is simply due to increasing your range of motion. It is very difficult. Your best option will be to discuss this problem with the surgeon who injected you. If you're not satisfied with the answer then consult another plastic surgeon.
Highly unlikely . Although anything is possible, this is highly unlikely.