The Donkey Kong Country: Tropical Freeze Walkthrough reveals the location of every KONG Letter and Puzzle Piece in the game.  Can't find one? 
Donkey Kong - Donkey Kong Country Tropical Freeze Guide - IGN
Donkey Kong Country: Topical Freeze Guide - Collectibles: Stage 4-4, Irate Eight
Donkey Kong Country: Topical Freeze Guide - Collectibles: Stage 5-K, Platform Problems
Donkey Kong Country: Tropical Freeze: Prima Official Game Guide: von Esmarch, Nick, Van Grier, Cory: 8601410565862: : Books
Donkey Kong Country: Topical Freeze Guide - Collectibles: Stage 4-B, Shoal Atoll
6-4 Blurry Flurry - Donkey Kong Country Tropical Freeze Guide - IGN
4-B Shoal Atoll - Donkey Kong Country: Tropical Freeze Walkthrough - Neoseeker
Donkey Kong Country: Tropical Freeze - IGN
3-6 Cannon Canyon - Donkey Kong Country Tropical Freeze Guide - IGN
2-6 Wing Ding - Donkey Kong Country Tropical Freeze Guide - IGN
Donkey Kong Country Tropical Freeze - Review
2-5 Alpine Incline - Donkey Kong Country Tropical Freeze Guide - IGN