TOMMY ATKINS A mildly sweet mango, has firm flesh and grows to be a medium or large size. Green and organge-yellow spots accent its dark red skin. Tommy Atkins mangoes are a medium to large sized mango variety weighing up to two pounds each. They are broadly oval shaped with a green skin almost always covered with a dark red blush with occasional orange or yellow accents. KEITT A sweet and fruity mango with less fiber, has firm, juicy flesh and grows to be a large size. The skin ranges from dark to medium green and is sometimes accented with a pink blush. The color can be misleading, and the only real way to determine whether these large mangoes are ripe is by touch. The skin should give slightly to the touch, and even then the mangoes could rest for a few more days.