The Grotato Farm is a location that first appeared in "Welcome Back". It is a farm where Fries grows his Grotatoes, and was seen working on the farm in that episode, loosening the soil.
Pin and Coiny asked him if they could have some of them, but Fries wanted to keep them for himself to re-create the fries that were eaten, rotten away or were burnt.
The Grotatoes are revealed to be newly-grown on the farm as of Welcome Back.
In "Getting Teardrop to Talk", Fries has more fries, which means that the Grotatoes have grown.
Pin and Fries are talking. Woody
can be seen walking on screen for a split second before the screen cuts to a different location.
Pin shows Coiny Grotatoes.