Both razor clams and grubs have somewhat of a place in the food tree despite being mediocre, but currently are ignored because of how hard they are to get in any kind of quantity.
Grubs should spawn inside mirkwood logs at the quality of the log. Mirkwood grub farms would be harmless if anyone decided to like them enough to do that. Stump/log checking in salem wasn't horrible imo.
Razor clams just need to spawn more frequently and in clusters. If I could get a table full, I'd use them for food. But if I can only find 1-2 per forage trip I won't bother picking them.