síu tou náaih wòhng bāau
小 is small, 兔 is rabbit, 奶 is milk, and 黃 is yellow, so 嬭黃 is milk yellow or custard, and 嬭黃包 is custard bun. Altogether, 小兔奶黃包 is small rabbit custard bun.
Steamed custard buns shaped to look like small rabbits.
custard bun
piglet custard bun
molten custard bun