Clanspeak

Carl understood clanspeak, of course, but only someone with two independent sets of vocal chords could speak it fluently.

Source: wiktionary

He spoke the grymjek, the clanspeak, better than Anna's own father.

Source: wiktionary

National Geographic: The hidden world of whale culture https://www.nationalgeographic.com/magazine/article/the-hidden-world-of-whale-culture-feature CLANSPEAK Members of a sperm whale family near the Caribbean island of Dominica are part of a clan that's culturally distinct from others. Each clan communicates in its own dialect of click patterns, like Morse code.

Source: wiktionary