coggly

I thought it must be a hard life for the man, wading day after day in the ice-cold water, and groping among the coggly, sliddery stones for the shellfish, and cracking open perhaps a thousand before he could find one pearl.

Little Rivers; a book of essays in profitable idleness Henry Van Dyke 1892

It was about a hundred paces long, composed of round, coggly stones, with just one patch of smooth sand at the lower end.

Little Rivers; a book of essays in profitable idleness Henry Van Dyke 1892

A long, coggly, cracked slate-stone, whose unsteady clatter would make the soberest steed jump over the moon.

Recreations of Christopher North, Volume 2 John Wilson 1819