Why are the Sanren psychic beasts in Naruto snakes, toads and slugs?

In Naruto, although there are toads, snakes and slugs, in terms of appearance, toads are undoubtedly the most and the most famous. After all, the protagonist's aura is there. So today we will mainly talk about three toads.

Toad Wen Tai:

The resident of Mother Mountain, the son of two immortals, is the strongest among the three toads, and also the first psychic beast to appear in Huo Ying the most times. He was led by four generations to fight Kyubi no Youko, and he has the power to compete with all snakes. He is Jiraiya's psychic, four generations of Muhuoying and Naruto. Good at dodging with water, cutting with a knife, and bad temper. He is still awkward for his younger brother. But Toad Wen is so afraid of the sea that he gets goose bumps when he touches it. I like smoking, my skin is red, I still have a red line on my body, I have a scar on my left eye, and I wear a coat with the word shrimp written on it, nicknamed Boss Toad.

Ran Guang:

When orochimaru invaded Konoha, Wen Tai's younger brother was summoned by Jiraiya to suppress the serpent with special functions. In the high wind, when Payne attacked Muye Village, he was brought out by Naruto to resist Payne's psychic beast together with toad Wen Tai, frog sword, Erxian and Naruto. In 545 words, Naruto and Bai Jue were psychic in the battle, and Bai Jue was crushed to death by the method of psychic and roof collapse. Its back is green, its belly is white, and there are two knives on its back. His strength is still ok, and he is good at dodging with water and using knives.

Frog sword:

Mrs. Wen's younger brother, personality: smart and polite. I like to say that I am stupid. I don't talk much, I'm tough. Combat experience: I fought against Perth Animal Road with Jiraiya and was praised by Jiraiya for my outstanding performance. Later, he fought Payne Road 6 with Toad, Frog Light, Erxian and Naruto. Photo: u-shaped tattoo with personality on his face. Holding the pot cover shield and mord is very protective, and the skin color is dark red. Ability: Use an attack weapon like a harpoon and a shield like a bowl as a defense. He is good at water evasion and defense, and his strength cannot be underestimated.