Moofish

A Moofish is an enemy encountered in the Tree Zone's second stage, In the Trees, in Super Mario Land 2: 6 Golden Coins. They are a hybrid of a cow and a fish. Moofish are found swimming in the tree sap. If Mario enters the sap it is in, the Moofish charges at him horizontally. To defeat a Moofish, Mario has to either jump on top of it or throw a fireball at it.

Perfect Edition of the Great Mario Character Encyclopedia
''' モーギョ 　アクア族 　うちべんけい ゲーム　ランド2 ''' 2本のツノをもつ化物 頭は牛なのに胴体は魚という変な生き物. 樹液の中を泳ぎまわり、動きが鈍くなったマリオを恐い顔で追いかける. 体は大きいし、ツノもあるけど、そんなに強い敵じゃない.

 Mōgyo  Tribe: Aqua clan Disposition: Haughty and boastful at home, but meek and reserved outside Game appearances: Land 2 ' A monster with two horns ''A strange creature with the head of a cow but the body of a fish. It swims around in the sap and chases Mario, with a fearful look on its face, when he slows down. It has a large body and horns, but it is not a very strong enemy.''