Say them in English.
That is how you say them in Japanese.
Since Trick-or-treating is a very Western thing to do. Halloween didn't exist in Japan until Westerners brought it over so "Happy Halloween" is the same in both languages; the only difference in Japanese is it is pronounced slightly differently because not all the sounds in English exist in Japanese
You may say 'torikku,' written: トリック
Bel trucco is an Italian equivalent of the English phrase "beautiful make-up." The masculine singular phrase also translates as "beautiful catch (gimmick, ploy, ruse, scam, trick)" according to English contexts. The pronunciation will be "bel TROOK-ko" in Italian.
Blague as a prank, tour in magic, and trucin cards and cheating are French equivalents of the English word "trick." The respective pronunciations will be "blahg," "toor," and "trook" in French.
Farce ou friandise is just one French equivalent of the phrase "Trick-or-treating" in English.Specifically, the feminine noun farce is "practical joke" in English. The conjunction ou means "or" in English. The feminine noun friandise translates as "sweet, treat" in English.The pronunciation will be "fahrss ooh fryaw-deeze" in French.
the phrase trick or treat has an American origin because on Halloween people often give candy (treats) or lay pranks on each other (trick).
"One trick pony" is just a phrase. It means just what it seems to mean -- a pony that can do one trick. Sometimes you can use that to describe a person who can only do one thing well.
While the tradition of going door to door "begging" for sweets and coins originated in Ireland and Scotland, the phrase "trick or treat" is purely American. The practice of "trick or treating" became popular in the 1950s, and it was during this time that the phrase became common. The implication is that is that "trick or treaters" will return to pull a prank if you don't give them a treat now.
damasu, だます, 騙す (to trick, to cheat, to deceive)
The phrase is "fate dealt a cruel hand."
blame game
The phrase "Trick or Treat" in French is spelled "Des bonbons ou un sort."
bamboozle