No, it will be fine for thumbnails. Thumbnails are my passion. We use this kind of container all the time for froglets all the time while growing them out or waiting for the time to build the next viv. Make sure you supply leaf litter for them to hide in. A piece of live Pothos will be appreciated. They would probably use a piece of wood too, but that's not a deal breaker. If you have a piece of ghost wood that is going to go in their viv, why not store it in their grow out container though?
People have even used plastic shoe boxes to grow them out for a month or three.
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