Looks you have EE's (easter Eggers) and Barred Rocks.
The last picture, the little Barred Rock on the right with the prominent comb might be a little roo.
The EE's can take longer to identify. The are a mix breed. They can have have all different kinds of combs because of this.
I have some with single combs that were large at this age and some that have the pea comb and it was small at this age.
You may have to wait another 4 weeks before you can tell for sure. Watch for early PINK combs with them.
That will be a good indicator of a young roo.
The last picture, the little Barred Rock on the right with the prominent comb might be a little roo.
The EE's can take longer to identify. The are a mix breed. They can have have all different kinds of combs because of this.
I have some with single combs that were large at this age and some that have the pea comb and it was small at this age.
You may have to wait another 4 weeks before you can tell for sure. Watch for early PINK combs with them.
That will be a good indicator of a young roo.