They appear to be from a mixed strain or strains... They most likely aren't anything line bred so as to have a legitimate pedigree. But there's nothing wrong with that as long as you love them and they love you... Actually very few rats are "pure breeds" and carry recessive genes so their offspring may look very unlike their parents.
Basically just go to one of the web sites that have photos of the pure strain line bred rats and compare your rats to them and go by what they look like and sort of work from as close as possible...
If your rat has curly whiskers you call it a rex... if it has dumbo ears, it's a dumbo etc... It certainly isn't genetically accurate, but it's good enough to describe your rat to another rat fancier.
This is our family rat Cloud.. she has dumbo ears, she has a blaze, she is blue, she has curly whiskers so she's a rex and her fur is silky... So I call her a blue blazed capped dumbo silky rex.... but really there's no way of knowing what her children would look like or her parents looked like with any real certainty. Some of her traits are double recessive and should show up in the next if bred with another double recessive rat, while others are dominant and may or may not make the next generation even if I crossed her with a sibling.
And when you start matching your rats to photos of pure bred examples you are likely to come up with one name while someone else will see things differently and come up with another. Yes, there are certain people that are "experts" or just really good at judging rats and know all of the standards, but unless you intend to show your rats and can prove their lineage... you own fancy rats, call them as you like close is good enough.