A kitten that isnt handled can take on feral tendencies from its mother, even at 8 weeks. You can easily socialize them if you remove them from the mom.
If you have the semi feral or feral mom in a foster situation and have handled the kittens usually they dont have the feral behaviors is my experience.
Just so people dont think were being irresponsible. Feral moms can get pregnant while nursing so we remove kittens between 4-8 weeks depending on the situation. Normally its the 6-8 week mark. We get her spayed. Our cut off point is 12 weeks as a rule of thumb for kittens. Other TNR groups may do it differently.
One thing I noticed is feral kittens do not purr cuz it gives their location away to predators.
Feral kittens do have a look. I agree. Its more in the body language. Or the way it hisses. Personally I love the puff hissing from kittens that are feral. They are trying hard to be so bad *** to intimadate you!