Your listings for "Gretchen", "Jodi", and "Jody" are all the same model.
In fact, the "Bookworm Bitches" episode from which the pictures are taken had two girls: Gretchen and Jody.
I cannot identify either of these girls in other databases (eg. IAFD), so perhaps they performed under other names.
If anyone knows of any other scenes/movies in which these two girls appear, please post a comment here.
All models are at least 18 years old.