Put up a sign or something. “Danger – Leeches, Do not enter” Just right in front of the bog. It’s not hard.
Hey, look. This one has hands. Still not looking for a hug, though. Strangely, it looks like this one is indoors? Not sure which plane this is, but apparently you aren’t safe going into houses, because you might find a murderous bog inside. Thanks, MTG Multiverse. You’ve ruined houses.
When the backwoods guides in Dominaria tell you the bog is hungry, they’re not speaking figuratively. Those tendrils aren’t the marks of a lonely bog just looking for a hug. Stay out of the swamp.