From Wiktionary, the free dictionary
Attested as tlọc in the Dictionarium Annamiticum Lusitanum et Latinum (1651).
trọc • (禿, 秃, 育, 鐲, 𬴭)
- bald (from shaving)
- (of certain landforms) barren
- đồi trọc ― barren hills
- hói (“bald as a result of male pattern baldness”)