I can tell you that, in the Human mind the word ( Tropical ) brings an immediate picture of the Coconut palm and a beautiful setting along a beach in Hawaii, Oscar would love a logo like this.
My mental picture of the logo is Coconut palms, like setting, on both sides ,a Sun shining over one palm with a rainbow over the palms , a beautiful Hawaiian girl, pointing down, with the Hula dance expression at all kinds of tropical fruits, on the bottom, arranged like the rainbow shape.
The Tropical Fruit Forum logo must blow your mind!. Once you see the logo, it shall remind you of all kinds of delicious,Tropical fruits, and beautiful places in Earth, were they grow, but most important, the logo should stay recorded in your brain, and remind you, to come back to the Tropical fruit Forum, site and surf around.
Carlos