Pickups

From TF2 Wiki

Pickups are objects that are spawned or dropped in various locations across most maps. These usually consist of varying forms of Health, Ammo and Metal. A player must walk into them to collect them, and will only pick them up if they are not at full Health, Ammo or Metal. Any regular item pick-up used in this way will disappear, and will respawn after ten seconds with a distinct sound effect.

Unique to the event version of Harvest are Halloween pumpkins which are spawned when players are killed. These Halloween pumpkins grant a 3-4 second crit boost when picked up. Picking up 20 of them will also complete the Candy Coroner achievement, unlocking the Mildly disturbing Halloween mask.