As you know you can cut teak and mahogany in the special arena where you have to pay some trading sticks to get in. Well if you seach theses 2 words in dictionary.com you get this explainasions: Teak: # The wood of this tree, used especially for furniture and in shipbuilding. Mahogany: The wood of any of these trees, especially that of S. mahogani, used in making furniture. + 1: wood of any of various mahogany trees; much used for cabinetwork and furniture So I think theses logs with be used for carpenter for sure. I'm like 100% sure. With farming they released some thing that you could collect before the total skill was released. Maybe they did it now to. but just without saying.