A vision with a chameleon shows that you have the ability to change and adapt to uncertain circumstances in your life, that no matter what is thrown at you, you can handle it.
I don’t know the complete circumstances of what your current challenges are but you may be anxious about facing an upcoming difficulty, but you will be able to adapt to your requirements and succeed in this task. However, a dream about chameleons is a channel to your devious side that is sometimes associated with people who have no worries or doubts.
Here is a great link that could help decipher your dreams.