Looks like a nice setup. Is the frog an albino? If it's normal, anything 40 watts and under should be alright, but for an albino you don't want to use a white light at all. What is the humidity in your tank?
Is the piece of wood something you picked up, or something from a pet store? I can't tell from the pics. If it's something you found outside, you'll want to bake it (for my snakes' driftwood decorations, I usually do 350 degrees F for about 20 minutes) to get rid of any bugs, fungus spores, ect. that could be hiding on it.
Also, just make sure that nothing has any sharp edges. If there are any exposed wire-tips on the plastic plants, even if they are under the dirt, it would be a good idea to use a drop of 100% silicone to seal them off since frogs' skin is so fragile.