Watch my stream on Tiktok next time to see how to make Plankboy. Or you can make Plankboy yourself by combining:

Plankboy = Rick + Watering Can + Sprout. There is a random chance (50/50) that Plankboy will appear. If you get a carrot the first time, just try again with a new Sprout.

Sprout recipe = Rick + watering can + bean. Beans are in your inventory and do not need to be crafted.

Watering can recipe = Rick + hammer + iron.

Hammer recipe = Rick + iron + iron.