Yes. All you have to do is do the push button code on the intro scroll screen on the N64 version(Khamleon). Thats the only way on the N64 version since the UKK was never found on the console. I am pretty sure that the PS version has a UKK, once entered you'll get Chameleon.Btw I don't know the push button code , but try a cheat site for it..

For the PSX version, select any of the 7 () male ninjas, and hold Back + HK + HP + BLK + RN before the round starts (same deal as H. Smoke in UMK3) and you get Chameleon. To fight him, after beating the game select treasure # 2.