Tam

Tam is an essential character who harbors a mission for the main character, you, in this case. Tam has accidently sold four Toxic Tubers to four different unknowing customers thinking it was zucchinis, which leads to the player having to repossess them on his behalf.

Location
Tam can be found in a worried state of standing to the left when walking through the entrance of Nava and will want to send you to find these Toxic Tubers as soon as you converse with him.