After watching B for a little while, he exclaimed "He's just like [our baby (who is about 3 weeks older and already built like a football player)] only mini!" and then after B had managed to steal a crayon, "He got my crayon? How'd he do that? He's pretty sneaky. We should call him...Sneakalicious!!"
Needless to say, we may have called B Sneakalicious a time or two since then; it does have a certain ring to it.