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"These particularly clever monsters bury themselves in deep sand or snow and disguise themselves as treasure chests. Anyone who approaches the chests is attacked. The treasure chests are not magnetic, which proves that they are actually a part of these monsters' bodies."
— In-Game Description
Treasure Octoroks are enemies which exclusively appear Breath of the Wild. They have 8 HP, and disguise themselves as a buried chest, only to pop up and ambush Link when he nears.
One simple way to distinguish a regular buried chest and a Treasure Octorok is by using the Magnesis Rune. If the buried chest cannot be moved with the rune, a Treasure Octorok will be hiding.