A tiny few traditional Halloween symbols can be found lurking in dingbat fonts you may already have such as the Wingdings and Webdings fonts that come with Windows.
Among the many ordinary and odd drawings in the Eller font are some ghosts, a skull and crossbones, and the Batman emblem.
Download Eller (Windows)
Sam's Dingbats Number 1 has lots of monsters, creepy or goofy faces, and Halloweenish images like bats, skulls, and pirates. The numbers characters are all bones (1 bone, 2 bones, 3 bones, etc.).
Download SamsDingbats1 (Windows)