Tsunomon

Tsunomon are round with a sharp metallic horn on their heads. They have orange fur and red eyes. Their name comes from the Japanese word "tsuno", meaning "horn".

Digimon Frontier
A Tsunomon, who later Digivolved into a Gabumon, was a student at Togemon's school. Some Tsunomon were also present at the Autumn Leaf Fair and the Village of New Beginnings run by Swanmon.

Digimon Data Squad
While looking for Thomas H. Norstein and Gaomon (who were pursuing Drimogemon) in the Digital World, Marcus Damon and Agumon saw two Tsunomon nearby. 10 Years ago as told by SaberLeomon to the Gotsumon that worked for Merukimon, a Tsunomon was among the small Digimon caught in a wind vortex when the humans who were deleting Digimon appeared.

Digimon World
Tsunomon lives in File City and oversees the building of the city. He also digivolves from Punimon and can digivolves into Elecmon or Penguinmon. However, in this game Gabumon digivolves from Koromon instead Tsunomon.

Digimon World DS
Tsunomon is one of the Starter Digimon. He can digivolve to Gabumon with Lv7, Gaomon with Lv8 and ATK70 or Dracmon with Lv12 and Dark EXP700. It's battle type is Attacker. He can also appear in Data Forest.

Digimon World Dawn/Dusk
Tsunomon digivolves to Gabumon with Lv8 or Goblimon with Lv12 and ATK60. For degenerate to Tsunomon is necessary Lv3.

 Attacks 
 * Bubble Blow (Acid Bubbles): Spits out tiny bubbles from his mouth.
 * Little Horn: Charges opponent with his little horn.