Water goat

... Water drum is said to have originated from hitting the water surface with a cup-shaped hand placed down, and is a popular name often used for percussion instruments that use water. Examples include the African water gourd, which is played by placing a cup-shaped gourd upside down in a container of water and hitting it with a thin stick; in Guinea, a shallowly hollowed-out rectangular board with handles attached to both ends is placed face-down on the water surface and hit with the board; and in Papua New Guinea, a cylindrical piece of tree trunk is cut into a shape with a handle attached, and the opening is struck on the water. [Gunji Sumi]
[Japan]
As a membranous instrument, it was originally called "tsuzumi," and although there are many theories about its origin, it is difficult to determine, but the character "tsuzumi" (drum) was used to describe it from an early period.

*Some of the terminology that mentions "water goad" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…　ウォーター･ドラムwater drumは椀形に丸めた手を伏せて水面を打つことから始まったといわれ，水を利用した打楽器にしばしば用いられる俗称。水を入れた容器の中に椀形のヒョウタンを伏せ，細い棒でたたく，アフリカのウォーター･ゴードwater gourd，ギニアでは浅くくり抜いた長方形の板の両端に柄を付け，水面に伏せて打ちつけるもの，パプア･ニューギニアでは木の幹を切って円筒形にしたものに柄を付け，開口部を水に打ちつけるものなどがある。【郡司 すみ】
［日本］
　膜鳴楽器としては，古くは〈つづみ〉という呼称が存在し，その語源には諸説あって定めがたいが，これに〈鼓(皷)〉の字を当てることが早くから行われた。…

※「ウォーター・ゴード」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報