雀仔公園的英文是什麼?

If you are referring a generic 雀仔公園, you can use aviary (鳥舍).

But if you are referring the 雀仔公園 in Mong Kok, Hong Kong, that is Yuen Po Street Bird Garden (園圃街雀鳥花園).

Aviary is a large cage or building for keeping birds in eg:-in a zoo;or HK Park Aviary.

雀仔公園==鳥類公園==Aviary;