I don't think the OP meant track fork ends, such as you find on a purpose built fixed/single speed frame.
You might be able to bodge regular tugs to fit, I had a go without much success: probably need to file off the back of the dropout.
Way back when, they were commonly fitted and they occasionally come up on
Ebay, but go for a good price. Try searching for "Cyclo" chain tugs.
They're not absolutely necessary and you only need one on the drive side if you do use them.