Hook-bang the Betrayer, Sheep the Beloved, Glasses the Doubter and Hairclips the Rock. I don't quite know enough about the other apostles to figure out the parallels.
Sure both of the central figures are about to suffer but I don't think The Falling Duck is part of the Sorrowful Mysteries.
The duck-head "nun" is Bartholomew. Glutton Nun is James the Lesser. Grey Bangs is Andrew. Hook-Bang, of course, is Judas. Scowl is Peter. Sheep Nun is John. Glasses is Thomas. Half-Bang is James the Greater. Smug is Philip. Strands is Matthew. Bunny is Jude. Star is Simon.
With the exception of Hook-Judas, I don't think any of these positions have special meanings.
This picture surely means something: do NOT trust Hook-bang, cause sooner or later down the posts, she shall betray the church for her froggy deeds. And after the 3 sings of the rooster has sung, glasses the doubter will cry and stop doubting of god... and latter, protagonist nun is going to ended up in “hot water”... that, or She’s may be the First nun of her time to do a t-pose...