I am xsfp and nine. I'm not sure what a chameleon type is. I don't change my behaviour and action much in any circumstance if that is what it is. I do fit in to almost any scene though. I think that is due to generally being more responsive than initiating.
Seems to me the types most likely to be chameleon-like in behavior are Fe types and Se types -- and especially the two types that combine both (ENFJ and ESTP). As for being chameleon-like in type itself, that would be exceedingly difficult because type does not define how one behaves. It defines how one thinks, which only has a marginal relationship with how they act. However, some functional combinations can look like others, or like one other function, to the naked eye. For example, Si + Te can make for a passable imitation of Ti.
i can see how people would say i am chameleon-like.
i don't try to change or act differently. i think that i instinctively expose different sides of myself at different times. there are a lot of sides to people, so i just try to stay loose enough to let any part take the lead.
i like to enjoy people, different people in different ways. and i like to enjoy different sides of myself. i don't feel i need to be the same thing to all people.
i have consistency of heart, consistency of spirit, consistency of principles - i have that foundation, and the rest of me can slide around free and loose on top.
if i am chameleon-like i think it is because i like to enjoy people - so i let myself adapt to the situation, adapt to a person.
i am an ESFP and a enneagram 9 also.