I've used the bigger snow flukes to make a belay anchor on hard snow, so the little ones should work the same way. The snow stakes are a different deal. When I was up at Yosemite, they kept pulling out because the snow was so fluffy. You don't see powder that often in the Sierra, but this time, it was pretty deep, so getting them to stay in the snow was almost impossible. One reason to use a freestanding tent. The snow was so deep and soft that when I stuck my skis in it, they went all the way up to the binding with little effort.

I asked this question on VFTT and using the stakes or something else as a deadman seemed to be a popular choice. With a deadman made from a branch, you could freeze it in and just pull out the line if you tied it off right.