Vodyanoi (Fae)(Large) – Grumpy old water trolls with lots of magical abilities and spells over water. They can be pleased by sacrifices and gifts, but if you get on their bad side they turn all the fish in the lake against you and the waters itself will raise up as elementals to crush your house, cattle or worse. They are often served by Boggarts. (Slavic)
River/Swamp Troll. These trolls take on the same principle system as the other types of trolls, offering transportation for travelers across treacherous waters for a toll. Tolls may vary in different regions.
Top 10 Unknown Disturbing Mythological Sea Monsters
Like the sea monster or sea serpent, various types of aquatic "people" share in the terror and mystique of the underwater world. Description from brer-powerofbabel.blogspot.com.au. I searched for this on bing.com/images
An interpretation on what real Deku might look like living deep in the forest. In the Legend of Zelda universe the Deku are a race of humanoid plant-like beings that often co-exist with other races. The term Deku often refers to certain plants or plant based items as well.