Hearing Sounds

I am a bit confused. No wonder :)

In my language a frog goes oac!; in English it goes croak!, but if you're from North America it'll go ribbit! Not to mention that in Ancient Greek it used to go brekekekex koax koax! :)) And I am sure that if I ask, you will come up with different answers.

I didn't know frogs can speak so many foreign languages !! :)) There is an explanation: species of frog found in another area may make another noise. Oooook, let's say I believe this. What about the dogs then?

In my language dogs go ham! In English, you all know, they go woof-woof! All the dog breeds, not just one... The sound a dog makes is ouah-ouah in French, gaf-gaf in Russian, wau-wau in German, ..., ..., .. and even meong meong in Korean :))

I remember hearing dogs in different countries... I am sure they made the same sounds. I thought at least the onomatopoeic words should be universal because they imitate the sound they describe. Why do we hear these sounds differently?