I don't think so, sir. Those are probably fiddlehead ferns, which can normally only be foraged in the Secret Woods, but are also available on the Forest Farm map (the map shown in the screenshot). It is usually difficult to forage a lot of them, but the Forest Farm makes it a bit easier.
The special weeds you are referring to also spawn in the Forest Farm map, but since the OP mentioned ferns, I think he did gather them and knows what he is talking about.