From RWP Wiki
Klaptrap is a baddy in the Donkey Kong series.
Klaptraps are small, blue-and-yellow quadrupedal Kremlings with disproportionately large, sharp teeth.
In the Games
Donkey Kong Country
In Donkey Kong Country, Klaptraps make their debut. In this game, a Klaptrap's main offense is to walk around, chomping its jaws. Klaptraps can only be defeated by Donkey or Diddy Kong if they jump on their heads, roll into them from behind, or toss a barrel at them; rolling into a Klaptrap from the front will cause damage to the current Kong.
Donkey Kong Land
In Donkey Kong Land, Klaptraps appear again, identical to their appearance in Donkey Kong Country.
Donkey Kong 64
In Donkey Kong 64, Klaptraps appear once more. In this game, Klaptraps attack by running towards the current Kong once he or she is in range, and then biting them. Klaptraps can only be defeat from the top, from the back, or with a long-rage attack, such as a produce gun. However, once a Klaptrap is defeated, its jaws will be left behind, and will wildly attempt to attack the nearby Kong. A Klaptrap's teeth can be destroyed in the same way as the Klaptrap itself.
One particular Klaptrap also appears in this game as the pet of King K. Rool during the game's cutscenes.