T-Rex Tree Frog Supplement - Calcium PlusT Rex Tree Frog Calcium Plus is a calcium supplement dust with added vitamins and minerals. If youre feeding your tree frog insects, there is no need for using a variety of different supplements. Just sprinkle this dust onto the insects before feeding, and combined with the dietary value of the insects, Calcium Plus will complete the vitamin, nutrient, mineral, and trace element requirements for your pet's feeding needs.