Froison Share definition Flag Froison is frog poison, milked from the sweet teats of poisonous tree frogs. It can be slipped into a drink or rubbed onto the tip of a dart. "Why did that guy fall onto the floor?""I spiked his drink with froison." Froison by Thom Thomlin October 7, 2009 0 0 Get merch Get the Froison mug. Buy Now — $32.95 See more merch