What is a melon cow?

When I was a child, when I saw a snail crawling slowly, we all called it "Guagua Niuer", pronounced gua 1 gua 1 nier4. When I grew up, I always wanted to know the origin of this "ancient ancient A Niu". When I looked up "snail" on the Internet recently, I came across that the pronunciation of this gua 1 has a history.

Online cloud: Snail is pronounced as "nest cow" in Mandarin, but it is pronounced as "melon cow" in Minnan dialect. Jay Chou has a song called "Snail", and Jay Chou said at the concert, "Let's sing a song called" Guan Niu "; Zheng Zhihua has a song called "Snail's Home". Zheng Zhihua pronounced snail (nest cow) as (melon cow).

It seems that "melon cow" is "snail", but people in many places like to say "melon cow". I see. This should be the result of mixed immigrant dialects.