Leptolalax sungi (Sung toad or Sang's metacarpal-tubercled toad) is a frog species in the family Megophryidae. It is found in Vĩnh Phúc and Lào Cai Provinces in northern Vietnam and in Guangxi in southern China.[1] Its natural habitats are subtropical moist lowland forests, moist montane forests, and rivers. Its status is insufficiently known. This species was first found along a stream near Tam Đảo village, about 925 meters ASL.[2]
Leptolalax sungi are the largest frogs in the genus Leptolalax: males measure 48mm53mm and females 57mm59mm in snout-vent length. Their back is granular with distinct tubercles but uniform in colour or with light spots. The sides have small dark spots. They have iridescent gold-green irises.[3]