White Leghorns have large single combs and yellow legs, so you are right that this bird is not a WL.
While it is common for EE's to have pea combs, they are not a standardized breed but rather a hybrid mix, typically of Ameraucana or Araucana on one side and any other breed on the other. Therefore, not only can EE's look pretty much like anything, EE's can have any type of comb depending on whether or not the EE parent carried both sets of pea comb genes....which is unlikely unless it was from the breeding of 2 pea combed birds. Therefore, it likely only carries 1 pea comb gene, if that Ameraucana/Araucana blood is anywhere close in the background, which ensures a portion of its chicks will be single comb depending upon what the mother was...if White Leghorn, undoubtedly a portion will be single combed (25%? as pea comb is usually dominant over single).
I can't get your photos to open up into large size, but the leg color looks close to a greenish haze, so if the farm had EE's as stated, I think what you've got is an EE or EE mix, which means it could look like almost anything as it is a barnyard mix of hybrids...and all those genes scrambled and recollected amongst the chicks.
LofMc
