The black and white one is in no way any color or mixed variety color I have ever seen.
The others could be blacks, it justs makes you wonder when the one comes out like that.
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None of these birds are splash.
I think you may not have gotten true ameraucanas. White ameraucanas are recessive white and would either hatch white or black carrying the recessive gene.
I am inclined to say they are probably mixed breeds or ee's. What color are their legs?