Logs?

[Osiyaim]

Are they made with a certain machine or found later?

[powerpiglet]

If you're talking about the schoolhouse/church quests, it's just the regular wood you can harvest from the birch trees.

[tkatlavendier]

Originally posted by Osiyaim:

Are they made with a certain machine or found later?

You get wood and birch from birch trees. There's so far only the two in the main area and you won't unlock anymore until you heal the forest completely.