Looks like a female platyrhinos ( Desert Horned Lizard ). A better pic showing more body area would be better. Like overhead and underneath view.

You need to feed her more harvester ants though. More like 50-100 daily or more if she will eat them. They need a whole bunch of ants.
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"A man that should call everything by it's right name, would hardly pass the streets without being knocked down as a common enemy." The Complete Works of George Savile, First Marquess of Halifax 1912,246