How to get frozen leaves off your lawn
A steel (not plastic) rake can do it, but it really is hard work. A mechanical option that works well is to use a de-thatching attachment on your lawn mower.
These come in many different designs ranging from metal prongs mounted on the front or back of the mower.
This one attaches to the front of mower
And the other option is to remove the mower blade and replace it with a dethatching blade like this.
I prefer the blade option, because the prongs in the front will clog up with leaves and have to be cleared out, whereas the blade with the springs does a good job of tearing the leaves up so they will break down faster in mulching and is less likely to clog.
Both methods will do two jobs at once for you, not only are you breaking free the frozen leaves, but you are dethatching the lawn at the same time as shown in this video.
The main problem a DIY Homeowner will have is the surprising amount of material being gathered, filling your bagging system within one or two passes. A way to speed up this process is to either get the trailer or pickup you are using to haul off the material as close as possible, or, buy a dozen small tarps and put them all around the lawn so you do not have as far to walk to dump your bag.
This is a fun video discussing leaf composting.