Minecraft wiki entry for Planks, associated text: Many items and blocks crafted using planks or sticks have textures that most resemble oak, regardless of the wood type used to craft them. On the other hand, item frames and fletching tables resemble birch, cartography tables and grindstones resemble dark oak, and barrels resemble spruce, while smithing tables, composters, chests, trapped chests, jukeboxes, note blocks, stonecutters, and the backs of paintings don't resemble any one type of wood.
Jungle, acacia, crimson, and warped are the only wood-types that don't have a utility block based on them.
Crimson planks and warped planks do not naturally generate, and are available only if crafted by a player.
Crafting an Overworld log into planks is more efficient of a fuel source than simply burning a log, as one log burns only 1.5 items, but four planks burn 6.