Idea: Blacksmithing, Pottery, Glass-Blowing, Sewing, Basketry, Leatherworking, etc.

Some more ideas I just had:
Threshing wheat & mustard (and whatever else plants can be threshed to separate the seeds from the reeds)
They can have a threshing stone surface and a threshing flail.

Then here can be winnowing (separating inner seeds from chaff). There can be a winnowing fork & winnowing sieve.

We an also have mills for grinding seeds, seashells, & softer rocks (like limestone) into powder.