hey! i've gotten many "assorted breeds" from
tractor supply and it's always quite the task trying to identify them. it looks like you picked out some good breeds though. the chick in the first picture looks to me like a japanese bantam due to the 90 degree tail, upright posture, and itsy-bitsy legs! i can't see the color too well, but it looks like it may be a black-tailed-buff or a black-tailed white. the second chick has feathered feet (it looks like), earmuffs, and a beard so i'll have to say that one is a bearded belgian d'uccle. if it doesn't have feathered feet, i'd suggest that it's an easter egger bantam. the third chick looks hard-feathered and more gamey than the others, leading me to suggest that it's a dutch, old english game bantam, or one of those more sporty birds. however, it could be a japanese bantam or any other breed, too! i can't tell if it has a single or rose comb. that may aid in identifying what it is. and the last chick looks like a white japanese bantam or an easter egger bantam. i can't really tell if it has muffs or not from the picture, but the tail looks very upright. again, these are just my suggestions, but i hope you get the information you were looking for!