How big can carpenter ants get and how small?

Yeah ima sking alot about these but, i was outside looking around to see if i can find a nest, i think i might have found the nest/ im calling an exterminator to fix this for us but for now.

I saw these TINY little black ants with the big carpenter ants, are these too carpenter ants?

Also is oatmeal oats okay to use instead of cornmeal/grits?
I dont have none right now only oatmeal oats i heard they work just as well

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