Just FYI, when selecting wood for a crankbait, the main criterion is buoyancy, determined by wood density. Willow's nominal density is 26.2 lbs/cu ft. Yellow poplar has the same density and there are woods like basswood (23), cedar (20), paulownia(16) and others that are less dense and more buoyant. In the end, you want the bait to float the same and behave the same as a L/P. That's more a function of where and how much you ballast the bait, and the finish steps you use to reach the same final weight than it is the wood type, per se.