They look to be a good size and are breaded and deep-fried; a good match for KFC. They're offered in a "Snackers" combo deal with 4 Shrimp Stars, fries and a medium drink for 3.95 Singapore Dollars (~$3.15 U.S.).
Other entrees available in KFC Snackers Combos include: Fish Donuts, a Drumstick, a Shrooms burger, a KFC Roller, Original Recipe Fillet Burger, and Popcorn Chicken.
If you're wondering what a Fish Donut is, it's pretty much a ring-shaped fish stick that KFC Singapore has offered since February 2012. It's also available at KFC Thailand. Here's a commercial from KFC Thailand that gives a closer look at the Fish Donut: