1) Usually young sheep, but could refer to pigs too.
These are not well documented terms, especially since they were sometimes abbreviated, a practice which makes it difficult to distinguish them from ‘hog’. Early references include: 1297 Item ij hogastr’, precium xijd, Bishop Thornton
1371 Item octo hoggettes precii cujuslibet xvjd per majus centum, Ripon
1426 multones et hogastros apud Brantingham, Spaldington
1459 pro Cust. hogastrorum in Apylgarth, Malham. Usually the animals referred to were young sheep but in the accounts of Bolton Priory the term could be used of either sheep or swine: 1303-4 Oves: Multones ... Oves matrices ... Hogastri: Porci: De hogastris .