How did the name of tadpoles in ancient China come from?

The ups and downs are heavy, full and heavy, and the tail is tortuous, which makes the stippling look like a tadpole. The name of tadpoles in ancient China was also named after this calligraphy by Han and Jin people. This unique brushwork is the inheritance and development of the ink brushwork of Shang and Zhou calligraphy, and it is a consistent and complete brushwork consciously established from the unconscious writing state.