Like me and Mark mentioned, the next best food ( other honeypot ants or some other suitable ant ) would be crickets.
I say pinheads because when you're dealing with a Horned Lizard that's not getting enough food and may be underweight, overloading it's system with more food or "heavier" food puts a strain on it physically.
A sick or underweight reptile needs to be gently coaxed back into health slowly. You're not trying to fatten up a Thanksgiving turkey. The more demand you place on the lizard physically, by making it deal with larger and excessive food, the more you will actually lower it's metabolism and other functions such as immune response.
For an adult of healthy weight and activity, the medium-small crickets are ok to supplement ants and other small prey.
But in general, many small items are better than a few, or one, big one. Especially with a sick or underweight Horned Lizard, the smallest is always better.
Mark may not have realized this, but I kinda assumed yours were probably going to be underweight given your statements, and your urgency.
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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

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