From Creatures Wikia
The Carrot Variant, colloquially known as the Bouncy Carrot, is a very close relative to the carrot that grows in the Norns' garden, but it seems to have evolved in a area where the toughness of its flesh was important. These carrots can be particularly useful for attracting the attention of a sick norn. Can you get a Norn to juggle a pair of carrots?
Pressing INJECT will remove any existing Carrot Variants from the world before planting 5 seedlings into the garden. These seedlings will self-seed but never to the extent of the native carrot.