Minecraft wiki entry for Grass, associated text: Grass and ferns.
Grass appears slightly offset from a grass block.
Grass and ferns in Bedrock Edition have a randomly selected height.
Grass growing in an mineshaft.
Tall grass that was set on fire using flint and steel.
Double tall grass may stump most hostile mobs, such as this creeper, however, mobs may be able to attack if they're right next to the player.
Grass that generated on sand.
Grass that generated inside a village house.
Grass generated on stone, due to a lava lake replacing the dirt.
Grass generated near underground lava lake.