According to this website, in the section labeled "I'll trade you for that wand..." you get different dialogue from the king if you beat a Koopa Kid while wearing a Frog, Hammer, or Tanooki suit. What is this dialogue, and how it it different from the original text? Note: I haven't played Super Mario Bros. 3 before, and so I don't know what the king's dialogue normally is.
The original text, if you beat the Koopa Kid with no suit on, says:
"Oh splendid, splendid! I am back to my old self again. Thank you so much. Here is a letter from the princess."
From this video.
If Mario or Luigi defeats a Koopaling while in Frog form, the restored king will say, "Oh me, oh my! You've been transformed! Shall I change you back with this wand?"
In Super Mario Bros. 3, if Mario or Luigi defeats a Koopaling while wearing a Tanooki Suit, the restored king will say, "Thank you, kind raccoon. Please tell me your name."
“Hey you! How about lending me your clothes? No dice!? What a drag!” —Kings, Super Mario Bros. 3