You're welcome.
No, there isn't. Not really. Because anyone can create infinite number of plz accounts, making a complete list is almost impossible, I think. But you can always just try typing [whatever you need]plz.deviantart.com in your browser and see what it gives you. Sometimes, on the plz account's page there will be a list of related plz accounts, or in the comments, or in 'friends', which makes searching easier.
Well, actually, here is some ATTEMPT to make a list:
OF COURSE, it's not a full list.