Deku Baba
These are found in the Kokiri Forest region in Ocarina of Time, and are very annoying plants on stalks that lunge forward and bite you. Some types simply spin in place, but all versions remain curled into a discreet ball until the player comes too close. They can be killed by a simple slash of the sword, and usually leave a Deku Stick or a Deku Nut. TheBoko Baba is very similar and the two are probably related.