Yes, if they have something else in them, the traits of the other breed often come out more as they grow up.
My oldest sister has a dog that is 7/8ths BC and 1/8th Springer. As a pup he just looked BC but now he's an adult, you can see the springer in his ears and a tiny bit in his face.

Thou shalt see...lol

PS. I'll try and get some photos of our Jess's big feet, haha.