1) The usual word for ‘hook’. It can be found in various contexts, e.g. for door ‘hinges’.
1399-1400 cum iiij crokys … ferri emp. pro ij ostiis Ripon
1443 pro bandis, crokis et snekkes, York
1537 for staples, banddes, crokkes, York. It occurs commonly also in workplaces where items were suspended from hooks, such as grindstones: 1568 a crook for a grunstone, Kendal
1587 a crouke for a grindle stonn, South Cave
1656 Item grinde stone and Crookes, Eshton or on market stalls: 1716 took the mutton off three crookes in the market place, Huddersfield. More generally it referred to an angle or bend, as in a field or fence: 1417 thar ys a cruke of Robert Feriby grund fra the privy un to the streteward, York
1628 a parcel of ground ... between the wall crooke on the west and Wibsey Slacke on the east, Bradford or a small angular piece of land, a nook: 1267 et omnes crokis prati, Eshton
a close called the Croke of the Holme, Killinghall
1610 the crokes and pittes adjoining Threapland
1667 in a place there called the Damn Croakes, Thirsk
1717 ‘other small parts, called crookes and crinkles’, Helmsley.
2) A hooked implement.
1251 cum sicco quod potuerunt prosternere per crocos, Pickering. A farming tool, particularly one used for ‘lowking’ or weeding: 1615 5 lowkecrooks, iiijd, Brandsby
1634 3 pease hackes, 3 looke crookes, Elmswell
1642 for pykes, they usually pull out the hey with hey crookes, Elmswell
1671 6 pitch forks, 3 pease croocks, Thorpe Willoughby.