Technically, Latin is
still evolving. There's some academics who have invented words for things that the Romans wouldn't have known, for example,
pizza,
car (autocineticum) and
garage (autocineticum stabulum). Why people are giving these Latin names is beyond me. Maybe there's a secret plot that, in Europe when it's all united, they're going to bring Latin back as the official language? :P
As for the sounds, sounds are
definitely mimicked. We can't really invent sounds because there are only so many possible combinations we can do (btw, my university major is Linguistics
)--for example, we can't invent any "new" sounds. There are sounds which we make in English which we wouldn't notice. If you don't believe me, check out the word 'infant', you say the
n as an
m, but you say it with your lips and teeth. (
n = alveolar,
m = bilabial, m between the teeth: labiodental) The reason you say this is because f is also a
labiodental (i.e., made between/by the teeth and lips) sound, and it's much easier to say toothy m and f than an n and f.