The Grass-type starter in "Pokémon Sword and Shield" is Grookey. It is one of the three Pokémon offered to players at the beginning of the games, alongside the Fire-type Scorbunny and the Water-type Sobble.
Grookey is a small, green, monkey-like Pokémon classified as the Chimp Pokémon. Its design is tied to rhythm and plants: it carries a stick made from a branch, and the energy in its body gives the stick special properties. Its Pokédex number is 810, placing it among the new Pokémon introduced in the Galar region.
Grookey evolves first into Thwackey and then into Rillaboom. The final evolution remains associated with music and drumming, using a large drum made from a tree stump. A common mix-up is to identify Rillaboom as the starter, but Rillaboom is Grookey's fully evolved form. The starter itself is Grookey, the first stage encountered at the game's opening.