Can you put a garden lizard in a hermit crab tank?

Well, yes you can usually.

First of all, take out the hermit crabs if there is any in the tank.

Second of all, you have to consider how long the lizard is staying in the tank for.

If the lizard is kept there permanently, then you would have to decorate the tank appropriately to what climate the lizard is used to. You should also see a vet, pet shop owner or someone that works with those lizards to get advise from them.

If the lizard is kept there for 1 to 3 days in the tank, it should survive if you give it fresh water everyday and food according to what lizard it is. It should still survive for 3 days even if you don't give it food but...yeah.

BUT DON'T KEEP IT IN THE TANK IF YOU HAVE THE CRABS IN IT.

(It could get chopped to pieces).