Can Reptilians shape-shift into inanimate objects, like a rock on the ground, perhaps in order to hide?

This is true as well, although seemingly even more implausible. But as you know, all of the seeming matter has consciousness and thus can be used as an anchor for a portion of the Reptilian being to connect its consciousness and use it as a base of operations. Here again, there are many implications for a variety of complications, risks, and hazards in trying to navigate the world of uncertainty. But it is better to know and understand the possibilities because forewarned is forearmed.