Tigger pods are always a huge hit. I have a pair of Mandarins that eat anything. The larger male pretty much ate everything right out of the bag, but the female took a bit of coaxing (and probably followed the example the male set) to get her to eat frozen. The male will occasionally even eat flakes and pellets.
I've had great success feeding my Mandarins Calanus and Nutramar. Mix about a half cube of each in a small container, let thaw in the fridge and then mix with some RO or tank water and hand feed with a pipette or feeder. We also add a drop of Garlic Guard.
Other frozen foods that have been immensely popular: brine shrimp, bloodworms (like spaghetti, slurp!), R.O.E. (popcorn for fish!) and the ever popular mysis. The Mandarins still hunt near 24x7, but when it's feeding time they're focused on whatever the other hyenas in the tank miss and let float down to the bottom.