I am going to try not to hate, but the bottom line is that neither of these ideas will work well.

First of all a 20 gal is WAY to small for a mixed species vivarium of just about any kind. If you wanted to attempt this I would say a bare minimum would be a 75 gal. Secondly, while the green snakes are mostly insectivorous, they definitely can and will occasionally eat amphibians and small lizards. If the anoles and frogs were big and the green snakes on the smaller side you may be able to pull it off, but it would always be risky.

While mixed species vivs sound cool, and can be incredibly interesting if done right, they are also the single most challenging way to keep herps for dozens of logistical reasons. If you do not have extensive experience with each of the species listed, you should not try this.

As far as the insect cultures... sounds like it would be a gross mess to me. It would be very hard to get the breeding rate and the eating rate to be equal, so either the predation would be too strong and the insect would die out, or the insects would overgrow and stress out an obese predator. It also just seems unhygenic. The only time I have seen this work is with springtails in dart frog vivariums.

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