What's the Name of That Book??? discussion

Hi! Some years ago, in the late 2000s or maybe early 2010s (no later than 2012) my mom worked at a school, and an author visited one day to do a reading or something. She got me a signed book, which I don't have with me right now and I just can't remember the title or the author.

I am convinced the author's name is Tony or something close, but I don't know the last name. I might be wrong but he probably wasn't particularly famous at the time since he was available to do a book reading for kids in Belgium (the book was English though and I think the author too).

It was a thin book, not very long, and a paperback, in my case. I think the cover was blue, with drawings (a frog, or a princess or something like that). It was a book of "rap" - I feel like the word "rap" was in the title, like "wicked rap" or something like that... And from what I remember it was basically one long "rap" telling a story. I don't think I ever properly read the whole thing so I'm not sure of the story... but I'm quite sure the theme was some kind of fantasy/fairytale story but with a twist possibly? A bit more modern, like with the rapping being a modern twist... I think there was a princess of some kind, and possibly a frog.

Other than this I really don't know anything about it - sorry for the really vague description! I hope someone recognizes it :)

Royal Raps by Tony Mitton maybe?

Yes, that's it! Thank you so much!