I would like to be able to delete a jpg file if it follows this naming convention (without the brackets):

❨Album Artist❩ - ❨Album❩.jpg

So the file will be different each time but it will follow the same naming convention.

I have looked at "Test If File Exists" function but it looks like expects me to know the name of the beforehand as does "Thrash Files And Folders".

If you want to delete the files in every folder containing a selected track, the following snippet works:

Set Variable 0 to "\!Path to Folder!/\[Album Artist] - \[Album].jpg"
Build List with delimiter "⏎" in named variable 'Deleted Files' from field Variable 0 string delimiter "\~"
Trash Files and Folders: "\<Deleted Files>"