[-D: Hey, Odacchi! I got a question! About Devil Fruits!! If Kaku and Kalifa said they wouldn't know what their Devil Fruit were until they ate it, how come Shanks knew what Luffy's Gomu Gomu no Mi was before he ate it?? Tell me! Tell me now!! Pleeeease tell me!!! P.N. Shirogitsunekko
O: Well, I think I'll eventually get to explaining more about Devil Fruits in the main story, but you see, there's a book of Devil Fruits. It has info about all kinds of fruit names and abilities, but few of the fruit can actually be identified by their shape. In the case of the Gomu Gomu no Mi, there was a picture and everything, but for Kaku and Kalifa, they were talking about how they wouldn't know until they had finally eaten the fruit. That was in Volume 40.-]
O: Well, I think I'll eventually get to explaining more about Devil Fruits in the main story, but you see, there's a book of Devil Fruits. It has info about all kinds of fruit names and abilities, but few of the fruit can actually be identified by their shape. In the case of the Gomu Gomu no Mi, there was a picture and everything, but for Kaku and Kalifa, they were talking about how they wouldn't know until they had finally eaten the fruit. That was in Volume 40.-]
Oda answers with "they were talking about how they wouldn't know until they had finally eaten the fruit", when asked about knowing the names of unknown fruits. Nothing confusing or ambiguous about what he said, the confusion is on your side mate 👍🏾
edit: spanish forum script
Kaku : Es posible averiguar de qué fruta se trata dependiendo del poder que nos dé.
Kaku : It is possible to find out what fruit it is depending on the power it gives us.