"Trap Hole", known as "Pitfall" (落とし穴Otoshiana) in the OCG, is an archetype of Normal Trap Cards. These cards are based on the original "Trap Hole".
Although they are related to the "Hole" archetype through the "Traptrix", they are a separate group of cards. Since all support for the "Hole" archetype also supports this archetype, in the TCG, the "Trap Hole" archetype is treated as a subset of the "Hole" archetype. The only card to mention "Trap Hole" cards separately from "Hole" cards is "Goblin Pothole Squad".
"Darkfall" (formerly known as "Dark Trap Hole") is not a member of this archetype since its Japanese name does not contain 「落とし穴」 (its Japanese name contains 「落とし大穴」, with the kanji 「大」 interrupting 「落とし穴」). "Chaos Trap Hole", "Gemini Trap Hole" are "Hole" cards but not "Trap Hole" cards, since their Japanese names contain 「落とし穴」but with the furigana for "Hole" (ホール Hōru) instead of "Pitfall" (落とし穴Otoshiana). "Gravedigger's Trap Hole" also is a "Hole" card but not "Trap Hole", since its Japanese name does not contain 「落とし穴」Pitfall but 「ホール」 Hole instead.
Trivia
A knight, an orange goblin, and/or a green goblin appear in the artworks of several "Trap Hole" cards. They also appear in the artworks of "Oh F!sh!", "Boogie Trap", "Trap Trick" and "Free-Range Monsters".