F2P Turkeys:
Turkey JD: Upstairs in the building to the north of the Lumbridge Forge.
Turkey Timbo: South of Varrock West bank.
Turkey Mark: Entrance of Black Knight's Fortress
Turkey Sky: South of Archmage Sedridor in the Wizard's tower.
Turkey Neena: Grand hall of Barbarian Village.
Turkey Osborne: Prison cell inside the White Knights Castle.
Turkey Balance: East of the Platelegs shop in Al-Kharid.
Turkey Pips: East of the Heroes' Guild.
Turkey Kelpie: Mudskipper Point
Turkey Pi: Wandering around the Duel Arena.

Member Turkeys:
Turkey Doctor: Wandering around the market of Rellekka
Turkey Manti: Inside of Oog'log.
Turkey Orion: Wandering around the fairy ring in the Haunted Woods.
Turkey MattHe: Inside the swamp in the Gnome Stronghold.
Turkey Kayala: Wandering around the Ardougne Market.
Turkey Hunter: Next to the whirlpool at Baxtorian Falls.
Turkey Chaose: On the back of Tuska.
Turkey Aob: Inside the Tree Gnome Village maze.
Turkey Jon: Southwest of Shilo Village, near the musician.
Turkey Maylea: Golden fruit tree south of Fremennik Province Lodestone.

Note; This isn't 100% skiller-friendly as some locations may require quests.

Rewards;
Find 10 turkeys and you'll get a set of turkey drumstick weapon overrides, plus the Thanksgiver title, herald cape crest and Turkey emote, if you don't have them already.

Track down all 20 and you'll get a large XP lamp, plus the Mackers pet, if you missed him in previous years.

Give this guy an upvote for the locations!:

Thanks for the post.

Thank you  - I didn't even realize there was an event!

What are the rewards?

What are the rewards?

You will get a set of turkey dumstick weapon overrides, + the thanksgiver title, herald cape crest and turkey emote if you didn't have them already.
If you track down all 20 you will get a large xp lamp + the mackers pet (if you missed him in previous years)