Sometimes, yes. Technically speaking, any chicken that carries one or two copies of the blue gene and is not an Ameraucana, Araucana or Cream legbar is an Easter egger or olive egger. Current hatchery easter eggers are sort of like the left over pre-breed who's great-great-great grandparents became Araucanas and then Ameraucanas.
Here are a few examples of some backyard bred easter eggers that look like a parent breed:
- I have an olive egger that looks JUST LIKE a little version of a French Splash Marans, except for her pea comb. Her dad is a splash Ameraucana and her mom is the splash marans.
- a polish crested easter egger cross will have a small top hat
- I've seen cornish cross easter eggers that have the telltale laced chest markings and general shape of a cornish cross.
- solid black or blue chickens that lay light blue eggs and have black faces have parentage from black (or blue) white egg layer, and other features can tell you which breed.
- If your easter egger has barring and lays olive green eggs (as apposed to regular green) there could likely be cuckoo marans in that bird
- A chicken that is mostly white and lays light blue eggs could have a parent that is a white leghorn.