Went to a camping in the Laurentians in Québec (Ste-Agathe) and there were those things near some camp sites. The sites are only accessible by footpaths. No car access. And if you bring a bike, you have to walk it up a hill, so I doubt they are bike racks.
Salt lick. Hunters use em for attracting animals. Takes time. You drop a big block of askt on the thing… that be my best guess at that.
OP said there is one at each camping spot and you can see the camp fire right there. That seems very close to be a spot for a salt lick.
10/10 I jump the gun on that one. I read the words food and got way to excited.