Are you thinking of including any fish too? This changes things a bit.
If you pick aquatic frogs then it would be fine, swamp frogs need more land than water. I don't see any problem with slate, unless it is too soft. Brush it well to remove the loose particles. Try to include bogwood too, this gives a better look.
Just wash the tank well, if you use bleach, rinse it then with a dechlorinator concentrate solution.
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