A note about your problem: If your freezer is sealing itself properly you should not have a frost problem. Most models self-defrost the small amount that builds up when you open it. I would check for door-drawer gasket leaks... I recently posted a fix for this and will repeat it here for you.
We recently purchased a new Kenmore French Door (side by side upper doors and bottom drawer freezer) and have had nothing but problems keeping frost-ice and dripping water (condensation on the ice maker) under control in both the top as well as the freezer section. Also, If I put a bright flashlight inside the fridge, closed the doors in a dark room, I could actually see light escaping from the doors and the freezer in several places. (use a mirror in difficult places.)
Warranty service on the unit has not helped with the technician using a heat gun to reform the gaskets in several places. They also replaced the metal slide rails in the freezer which helped a bit but did not solve the whole problem. I was also told that new gaskets come folded so much that we would be worse off than the ones currently in our fridge.
I searched the web for a solution and some even suggested adding (YUCK) petroleum jelly to the gasket. I would only try that as a last resort.
My successful fix was to add HEAVY DUTY magnetic tape to the metal fridge surface where the door seal tries to seat. This is not your typical box-store tape so don't think they are all created equal.
Part of the reason why this works is that most door gaskets have a magnetic strip inside them. My problem solution works well because the gasket and the tape strips attract each other and the magnetic tape also adds a bit more thickness to the fridge side of the equation.
Source for the magnetic tape: Amazon... just search for... Master Magnetics - B005HYDC68 Roll-N-Cut Flexible Magnetic Tape Refill - 1/16" Thick x 1/2" Wide x 15 feet. (1 roll), 07518.
With the tape installed, our frost-ice buildups and water drips (around the upper ice maker section) as well as all the light leaks have been eliminated. best of luck.
10-2-22 update:
Our model 11175039120 bottom freezer unit has two defrost drains under the evaporator coil (remove back cover in freezer compartment). The right drain is TOTALLY BLOCKED with insulation foam and a plastic panel of some sort put in by Kenmore. This causes a constant lake of water/ice to form under the evaporator coil with ice filling the evap. fins putting excess water on both circulation fans during defrost cycle causing them to vibrate and\or freeze up and STOP during the next freeze cycle. This fan motor freeze-up gets worse as the fan motors age and let more high-humidity air inside them to freeze. 4681JB1027C Refrigerator Evaporator Fan Motors are available on Amazon and fit (you will need to solder original electrical connectors) perfectly. Kenmore fan motors (if you can get them) are about 150.00 each. Amazon fans are less then 30.00 each.
Still trying to figure out how to clear out the right defrost drain.
Great going Kenmore! A design or assembly flaw that does wonders for your reputation.
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