CARP, verb intransitive Literally, to snap or catch at, or to pick. Hence, to censure, cavil, or find fault, particularly without reason, or petulantly; followed by at.

No, not a tooth or nail to scratch

And at my actions carp and catch. Herbert.

CARP, noun A fish, a species of cyprinus, an excellent fish for ponds. These fishes breed rapidly, grow to a large size, and live to a great age.