In the correct contexts, yes. If anyone else would like to write up their own consideration of these tools as used in combat, please don't let this post stop you! We always welcome further posts on the matter, since there's never a 'final' answer. For the meantime, OP, here's a few previous threads considering those two implements:

• u/wotan_weevil considers the trident in two previous threads;
• while u/Noble_Devil_Boruta and u/white_light-king both examine the scythe.