Uktzin 3:3

The carcass of a non-kosher animal in all places and of a kosher bird in villages requires intention but not to be rendered susceptible. The carcass of a kosher animal in all places and of a kosher bird and fat in the market don’t require intention, nor to be rendered susceptible. Rabbi Shimon adds a camel, hare, hyrax or pig.

Uktzin 3:4

Dill, after giving its flavor to a dish, is no longer subject to the laws of trumah and no longer conveys food impurity; sprouts of hawthorn and candytuft, and the leaves of wild arum, don’t convey food impurity until they’re sweetened. Rabbi Shimon says that colocynth leaves are like them.