Not very likely, no
The big problem for you is that saccharides are yummy food for everything from fungi, to bacteria, to insects, to animals, to big hairless apes of the species Homo Sapiens. You will need a place that is pretty much sterile in order to not have living things eat all of that delicious sugar.
Another big problem is that sugars are water soluble. You would need to have a Dead Sea like situation where sugar water is running into a basin and then evaporating away.
And then of course you need something that produces all of that sugar in these conditions. Can this be done?
You would need...
- Something that produces sugar. Honey bees would be the obvious choice.
- A way of moving the honey from the bees' nest
- A way to sterilize the honey and everything around it
- A way to let the honey recombine into crystals
So... suppose that on a volcanic island on the equator, lush with many different exotic plants and fruits, there is a cave. In that cave there is this huge bee colony.
The cave is not entirely water proof. As the daily tropic rains fall on the island, water does leak in and leech honey away from the colony.
The honey-water drains into cracks and crevices that takes it deeper into the cave. These streams pass over rocks that are heated by volcanic activity. The honey-water is brought next to boiling.
The now pasteurized honey-water reaches deep recesses of the cave, where it goes no further but instead drips, pools and evaporates due to the heat. The leftover steam vents out upwards, leaving the sugar in huge crystals of rock candy.
So who knows... one day you might find that Big Rock Candy Mountain. ;)