Wood
From The Blockheads Wiki
How to Get
Wood is obtainable when you cut down any tree. More wood can be harvested more efficiently by using an ax. Each block of wood harvested with an ax will produce 3 wood. Blockheads can also burn the tree up with an ember or campfire, but this produces less wood.
Other
Wood is a very important resource. A blockhead can plant maple seeds and pine cones to grow more trees for wood.