Frogs can squish through pretty tiny cracks compared to how their body size. If they can push the lid up even a little bit to make a small gap, that could be it.
No chance the frog is hiding in the tank? Buried in the substrate?
No chance it managed to get out of the screened in porch?
You could leave a few water buckets around outside in the hopes that it returns for a soak.
I don't think he is in the substrate because there would probably be a lump right?
He might be able to get out of the porch, but I wouldn't think he could travel really fast. Could he?? I have like five all around
Erm, how big is the size difference between the two frogs

A matchbox seems pretty small compared to a 3.5" frog
Anyway, good luck, and I hope you find your frog in good shape.