Jalapeño is a power-up plant in Plants vs. Zombies 3. When planted, he will explode and cover the lane he is placed on in fire.
Jalapeño is based on the plant of the same from Plants vs. Zombies.
Jalapeño is based on the real life jalapeño, a cultivar of the plant Capsicum annuum valued for its spicy flavor, referring to the fact that Jalapeño is hot and spicy, burning an entire lane as he explodes.
Plants vs. Zombies Wiki has a gallery for Jalapeño.