Most Gundam models have this sort of double knee joint. Meaning there are two points of articulation in the knee, some of them even have it to the point that they can touch the back of their head with their own foot.
It's kinda hard to see, but it's there, I saw it.
Speaking of articulation, you can move the tongue/scarf.
And yes, that's it's tongue. I thought this was common knowledge but apparently it's not.