I saw it used recently but don't remember the line. It was being used toward a group of subordinates, as 小奴ら. I can't find the word in any dictionary or being explained online. What is the meaning and reading of 小奴?
こやつ is a dated word used in place of こいつ. It often has a derogatory or accusatory nuance. Today, we mainly see こやつ in samurai dramas, historical novels and such. If you heard this used referring to someone's subordinates, probably it was for showing his humbleness to someone else (ie, introducing A's subordinates to A's boss).
By the way, according to this page, 小奴（こやっこ）seems to refer to "infant" or a certain type of servant in the Edo period. It's a very rare word, and I'm not familiar with this.
I think that is こやつら (koyatsura), which I would translate as something like "These f****** bastards".
奴 is a derogatory way to say "he/she". Something like "This man".
Putting the 小 before 奴 makes it worse, and shows more anger and disrespect for the subject.
ら is just to make it plural.