Originally Posted by james kent
If it doesn't move and it should ... WD40
If it moves and it shouldn't ... Duct Tape
The first two lines of the Handy-man's credo.
Actually, when a stove knob freezes it could be one of two problems. If you used the stove a lot last season it could be grease and dirt collecting under the knob and cover which hardens with age and non-use. Or, not very likely, corrosion.
If corrosion, WD40 in moderation.
If grease and dirt I would try a de-greaser before the WD40. Although...WD40 will penetrate and loosen the grease.
Main thing is to use non-flammable chemicals in moderation. If you do use a volatile chemical make sure well ventilated area, no open flame or spark and clean thoroughly prior to use.