Tomato frogs are any of the three species of genus Dyscophus (family Microhylidae): D. antongilii, D. insularis, or D. guineti. Dyscophus is the only genus in subfamily Dyscophinae. They are endemic to Madagascar
The common name comes from D. antongilii's bright red color. When threatened, a tomato frog puffs up its body. When a predator grabs a tomato frog in its mouth, the frog's skin secretes a thick substance that gums up the predator's eyes and mouth, causing the predator to release the frog to free up its eyes. The gummy substance contains a toxin that occasionally causes allergic reactions in humans. The allergic reaction will not kill a human and the frog secretes it only when frightened.