Two Stones from Texas

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Ok, just when I think things can't get much more interesting than they already are, I find what appear to be 2 different stone tools near a damn in South Texas. They were approximately 40ft apart from each other on the surface of the dry land right next to the river. I had them for about 2 weeks before I realized they go together. They both have a green spot on them that match up when put together. It wasn't until about 2 weeks ago I realized they also make what appears to be the head of a trex, maybe. It also has an indention on the top right side of the head that allows you to tilt the top piece as though the figure is opening its mouth. If this is what it appears to be, to me, I would like to know what the terminology for this would be.