while all that works well for an aquatic environment, which has filtration to deal with the minute traces of sap that may extrude from the wood (the sap never leaves the wood), things are a bit different in a vivarium. there is no filtration to help, and frogs absorb everything through their skin. if any sap were to extrude from the wood, and the frog contacts it, it will absorb it directly into it's body. it's always better to err on the side of caution when it comes to frogs, due to their unique and delicate nature