From the Super Mario Wiki
A Turtley Leaf (called a Koopa Leaf in Paper Mario) is a special leaf used for tea found in bushes in Koopa Village and next to Mayor Kroop's house in Petalburg. It restores three FP, but when mixed with other ingredients, it can help create a recipe that benefits the player even more.
Turtley Leaves reappear in Super Paper Mario with a much more useful ability: reducing damage taken by ½ for 10 seconds. Koopa Troopas (and related Koopa types) may drop them when defeated. Flimm also sells them at random.
Names in other languages
||Tartaruga (turtle) + foglia (leaf)
- ^ "Paper Mario: The Thousand-Year Door: From Japanese to English". The Mushroom Kingdom. Retrieved March 25, 2015.