A chameleonid definitely needs to have a color-changing heritage move. Maybe something like…
When you spend a few minutes observing your surroundings while motionless, take +1 ongoing to attempts at stealth while in that area.
Perhaps some chameleonids can’t change colors as well but have more pronounced horns that could be useful in melee combat.
When you charge horn-first and attempt to gore something, deal 1d6 damage that ignores armor when you Fight.
It’s probably tougher to get a broken horn repaired than a sword, though. Maybe your horn becomes fragile if you use it too often.
Chameleonids with vestigial horns that are unable to change colors could have a more dexterous prehensile tongue…
When you use your prehensile tongue, you can interact with anything within reach as if it was at hand.
Bulging eyes that move independently would sure be handy.
When you have an unobstructed line of sight in all directions, take +1 ongoing to Perceive and Stay Sharp.
Also, I imagine chameleonids would be wary of any bird- or snake-people they come across.