Living on Grief Street, I just exchanged, much like expected, 5mio for 300k. Is there an even chance to get any of the 4 Frog items or are odds tweaked in a way to make the books rarer than the wearables?

With Subeta's focus on Wearables I would rather assume that these are the "rare" items as well should there be a difference in rarity for the items.

Judging by price deflation on them rather not :-(

i don't know about the actual odds, but i bought a bunch for the crown + books recently and got basically half warts - 2 frog royalty crowns, 3 gratitude of the frog prince, 1 gratitude of the frog princess, and 4 frog royalty warts. i may have been particularly unlucky though, so ymmv