Yes, you can use kibble (not plural) to mean dried pet food. Example sentence: My dog loves eating kibble. ^^ Hope this helps!

Yes, it can be used that way. While the full etymology of the word is unknown, most Americans (at least, perhaps English speakers in general) will recognize it because it's in the name of an extremely prominent pet food named "Kibbles 'n Bits".

U.S. native speaker here. Yes, we use "kibble." It means dry pellets of ground pet food. I just checked with my wife, who's a retired veterinary technician, and she confirms what I thought: the word can be used BOTH an uncountable noun--"We feed our dog kibble," AND as a countable noun for the individual pellets, "To give your dog this medicine, try hiding the pill among the kibbles."

To add a British perspective I had never encountered this word before until it was just mentioned.

I have only heard it used in the singular form "kibble". Yes, it means dry cat or dog food.