Dragon Tongue Grass was actually another name for reed. In ancient times, many people would call reeds the Dragon's Tongue Grass.
Dragon's Tongue was a kind of grass growing on Kunlun Hill. It was shaped like sunflower and tasted like green onions. Eating it could relieve one's worries.
Dragon's Tongue referred to plants that grew in water, such as hornfish.
Dragon's Tongue was a perennially growing plant of the family Graminacea and the family foxtail. It has a scale-like horizontal root, the stem is upright or the base is creeping, and the height can reach 60-170 cm. Except for the long white cilia at the edge and the sheath mouth, the other parts of the leaf sheath of the grass were basically hairless or only a few scattered hairs. The stem of the grass is hard, smooth or dense with hair at the sheath node. As for the other characteristics and significance of the Dragon Tongue Grass, the information provided so far did not mention it.
Dragon tongue in Harry Potter fanfiction can also be a symbol of power. Characters who possess dragon tongue or know how to use it are often seen as more powerful or special. For example, a powerful dark wizard might be seeking dragon tongue to increase his already formidable powers, while the good guys are trying to stop him from getting it.
Maybe it's just being playful or trying to be cute.
There might be a fanfic where a young witch uses dragon tongue in her potion - making. Since dragon tongue is a very rare and powerful ingredient, it causes all sorts of unexpected effects in her potions. This could lead to her getting into trouble with the professors at Hogwarts, but also might help her solve a big mystery in the end.
The moral could be that positive words have a positive impact. When we use our 'good tongue', we can create harmony and good relationships. In contrast, the 'bad tongue' shows that negative words can cause harm and destruction.
Often, a manga girl's tongue is shown to add expression or emphasize a certain emotion. It could be shown as small and delicate when she's being shy, or bold and confident when she's being mischievous.
It might be a piece of candy or a treat. You know, kids love to have something sweet in their mouths during the Christmas season.
It could be something related to Christmas treats like a candy cane or a piece of gingerbread.