If you visit some of the 'street food' markets in the urban cores of Rawalpindi or Lahore you can find food cart vendors with fried sheep and goat testicles for sale. It's fairly common.
Would recommend trying them if you get the chance. Worth it.
I think this qualifies as the sentence I have least expected to read on this site in my many years of enjoying Hacker News
People will eat the strangest things if they believe it will make them more "manly".
"calf fries" is apparently the panhandle localism.