作り茸 (hiragana つくりたけ, katakana ツクリタケ, romaji tsukuritake)
Compound of 作り (tsukuri, “making, producing, manufacturing”, the 連用形 (ren'yōkei, “stem or continuative form”) of verb 作る tsukuru, “to make, to produce, to manufacture”) + 茸 (take, “mushroom”).