Through a little Googling, I found this interesting tidbit:
From Freaky Trigger, a UK blog:
"Sweetbreads: culinary term for the pancreas or thymus. However a lot of people (myself included) still think sweetbreads are testicles...But the culinary term for testicles is sometime sweetmeats.
Wikibooks has the best definition I have ever seen: Sweetmeat is the culinary name for testicles. Despite the name, sweetmeat is not sweet and is usually not considered to be meat."
The moral of the story is sweetbreads = glands &
sweetmeats = testicles.