Masher
From Sonic Retro
Masher (called Gabucho in the Japanese manual) are piranha bots in Sonic 2's EHZ that behave similarly to Sonic 1's Chopper (called Batabata in the Japanese manual) enemies, except that these guys hang out at waterfalls rather than bridges. You can simply take them out with a simple spin attack as they don't have any damaging attacks to be aware of.
Technical Information
2D394 Masher object offset
839EA
Masher sprite art (Nemesis format compression, 22 blocks)
5C
Object function number