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https://nature-mentor.com/chickadee-calls/ I had a dog that I taught American sign language. She understood dozens of signs, but didn't have the capability to 'speak' the language because ASL requires hands. But Koko the gorilla learned ASL, both receptively and expressively. She had a vocabulary of over 1,000 signs and could understand around 2,000 words of spoken English. Her sign vocabulary included basic signs like "food" and "drink", emotional signs like "sad" and "love", and more complex signs like "obnoxious" and "polite". Koko was also able to combine signs to create new meanings, such as calling a ring a "finger bracelet" and a mask an "eye hat".

The Ebu Gogo accounts are probably Homo Flores https://en.m.wikipedia.org/wiki/Ebu_gogo They seemed to have their own primitive language. But they could parrot words well with no understanding

My random dude on the Internet take is (with all the expected disclaimers "assuming they exist" etc) that these aren't language because bigfoots aren't capable of language. They're a relic hominid that never evolved language but did evolve speech. That's why it isn't translated. It's just noise/calls. Speculating of course, but my assumption is they don't have a developed Broca's area. They have one, but it's not as complex as ours. So they can articulate but not speak language. The entirety of their communication comes from the tone, speed, frequency and body language. The vowels and consonants are irrelevant except where they serve the clip speed or divide the vowel sounds in pitch. Thanks for coming to my Ted Talk.