Create Wooden Mallets for several bots. Those bots will need to use those mallets on Pine Trees to get Sticks and use the mallets on Apple Trees to get Apples. You will need lots of bots to get lots of sticks and apples to make the foods.
I suggest that you build a canoe and a paddle for the canoe and then travel to the land on the left side of the map. There are many apple trees there. Once you have revealed that land, you can put bridge blueprints down so that bots can build bridges there (since you can't carry a bot when you are in a canoe). You should use the canoe to reveal all of the hidden land on all the edges of the map.
You could cut down the apple trees to get the apples, but hitting the trees with the mallets will give you apples without losing the trees. If you cut down the apple trees you would have to dig holes and plant apples in the holes and wait for the apple trees to grow again. It's faster to just use the mallets.
You can dig holes in the ground and plant apples in those holes that grow into apple trees. Any place that you can dig a hole for a pine tree could also be used for a hole for an apple tree. I like to keep my apple trees in an area that is a bit away from the pine trees.
Also, since you can build bots that hit pine trees with mallets to get sticks, you can build bots that hit apple trees with mallets to get apples, so I like to keep the apple trees in one group and the pine trees in another group.
In the current version 21.2, the only thing that you can do with a pumpkin is to smash it with a mallet to get pumpkin seeds, which you can then plant to get more pumpkins. The pumpkin cannot be used for food in this version.
In talking about the new version being developed, Denki has said in https://denki.itch.io/autonauts/devlog/45847/all-the-worlds-an-autostage "There’s no mistaking who ate all the pumpkin pies here", and he shows a bot taking pumpkin pies from a storage bin and feeding them to a very fat folk.
Also, I asked Denki "How do you carve pumpkins into Jack-o-Lanterns?" and he said in https://itch.io/t/118969/autonauts-faq?before=244
"Unfortunately Jack-o-Lanterns were only active for V18 Halloween :( There isn't anything to make with Pumpkins yet but we'll add that in another version."