my snowblower chute and impeller (2 stage) was having icing/freezing issues. i tore it all apart and lubed with silicone. and while i was at it replaced the 3 chains (broke a mcmaster chain last year - switched to tsubaki) and 2 belts... no issues yet this year. my 50 year old snowblower gets a lot of use last few years...
i'm gonna try the duct tape method to keep the chunks from forming - than spray that with silicone??
peg in an inner tube- bicycle would be best size wise.
The teeth will come through, but the peg will not really fill with snow/ice.
Snag a blown tube for nothing & a bike shop and give it a shot.