The "Tin Woodman" can chop down the "Fighting Trees", now the question is: is this ability played as an action (like playing one card) or a free action, my searches have been unable to find out, is this ability an action or a free action?
According to The Rules:
Optional actions allowed by new Rules, Keepers, etc., may be performed at any point...
...during the turn sequence. This would include chopping down the Fighting Trees.