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] This species was first found along a stream near Tam Đảo village, about 925 meters ASL.

[3] Leptolalax sungi are the largest frogs in the genus Leptolalax: males measure 48–53 mm (1.9–2.1 in) and females 57–59 mm (2.2–2.3 in) in snout-vent length.

Their back is granular with distinct tubercles but uniform in colour or with light spots.