Is it possible for my cat to teach my rats how to hiss?

i have had rats for about 8 months and recently we bought a kitten, she's 10 weeks old and a little weary of the rats (as to be expected) so when they jump up the side of the cage to investigate she often hisses. well its only since she has been doing this that the rats have started hissing, now i know rats hiss as in bare teeth hiss but they seem to be doing it through their noses and i was just wondering is it possible that the kitten has tought them how to hiss??