Carp is a generic name given to a bump and go fish from Chuang Xin.
A pink and an orange goober
It resembles an Oranda goldfish, with a translucent tail and translucent fins. They can come in green, orange, or pink, and they have white lumps on their heads and some white scales on their face and body.
They open and close their mouths, move their left and right fins and their tails, and they move across surfaces using their bump and go wheels. They play music, but I don't know what song they play, as there don't appear to be videos of it.