Scuba Toads were supposed to appear in Stranger's Wrath and were originally supposed to row Stranger's boat to Last Leg's and eventually onto Sekto's Dam. Unfortunately, they were cut from the final version for unknown reasons.
Scuba Toads appear to be short, fatter versions of Grubbs. Whether they are related or not is uncertain. Not much is known about them other than the fact they may have been fishermen before they were forced from the Mongo River, hence their harpoon-shaped spears.