Strange medical related questions time!

1 I put 2 kinds of wood in the tank. (I was kind of short on things for him to climb on so I gathered some fallen tree branches from my yard, washed them with soap/water, and froze them for a few days.) Unfortunatey I am not knowledgable in which kinds of wood rot when wet and which kinds do not. Thus about a week later the cage started smelling kinda bad and the lighter colored wood turned white. ( Live and learn...) When I discovered this, I immediately removed that piece of wood but left the darker colored ones in. (since they do not seem to be rotting... I think.) My question: Could this be harmful to the frog? Should I take it out and totally clean/redo the cage? He still explores a lot if I let him out of the cage and eats normally. I don't see any strange wounds or anything unusual that might be different from when I got him except he's a little more brown then before. (I assume from the cold. His tank is 80 in the day time but when I turn the heat lamp off at night it gets down to 70-65 temps.)

2 When I got him he was energetic as a wild bred and didn't have any cuts or bruises blemishes or the like. (Only 1 year old so it made sense) But I noticed that the under side of his legs were red. Is this normal for White's Tree Frogs? (I never saw it mentioned in the care sheets)