Hello Pandamanda! I'm so happy to hear your upgrading Ollie's home. I agree with everything InfinitysDaughter has said...
As far as the heat lamp goes, my white's really dislikes any kind of light (blue, red, purple) at night, darkness is best. If you need heat at night you could get a low wattage ceramic heat emitter (but be careful, these get super hot and can also dry out the enclosure very quickly, and also your Ollie boy!). Or get a UTH heat mat and stick to the side of your tank. Those don't give off much heat, but certainly help at night when a frog likes darkness at night...

Oh, and as far as the wood goes, I just purchased wood that is used for aquariums (I have no idea what type of wood it is), but I'm sure Josh's frogs has a great selection of wood you could get. Josh's Frogs - Largest online herps feeders and reptile supplies store