In the old days, this type of boats was commonly used by the royalties in the north; Chiengmai, Chiengrai sort of. They had various names such as ruea (= boat) Laos, ruea hung mang pong (= scorpion’s tail --- one's clearly shown) and etc.
Mae Ping River (Don’t know when. Just look cool!)
It is estimated that the ratio of the number of Chinese living in Bangkok in the reigns of King Rama V-VI (late 1800s – early 1900s) was up to 1/3
(Note: Male’s hairdo (pigtail) and the little girl's 'ta-ping' and ankle bracelets)
We (Thais) call this food stall 'yong yong lao' (yong yong = the way they sit / lao is derived from a Chinese term which means restaurant)