Because the "tongue" of the pig's tongue is homophonic with the "fold" of the folded book, which is a bad implication.

People who do business or buy food want to make good luck, people who sell vegetables want to make a fortune, and people who buy food want to make a lot of money at home every year.

So I don't know when people will avoid the name pig tongue. In their minds, this is an unlucky word, and mentioning it is like mentioning "death".

In our hometown, there is another name for pig tongue, which is called pig earning. The moral is to make money every year and live better every year. During the Spring Festival, there will be a dish made of pig's tongue on the dining table. We all say it's the profit of pigs, and eating it will bring good luck.

In other places, there is another name for pig tongue, called "Koutiao". In fact, this means tongue, and the notes in the mouth are not tongue.

In a word, people don't call it pig tongue because they think too much, so it's not surprising to change their names at will for a good omen.