Zel might also ask to get into the palace library for information about the turtle, but he'd be more thinking in terms of a biological sickness. Which... he has no idea on how to treat, besides a bit of herb knowledge he picked up from being his grandfather's occasional go-fer.

So basic questions of the turtle's history and biology, with an emphasis on 'does this thing get sick and can we give it medicine if we can grow enough for a giant turtle'? He can also copy out anything in languages he doesn't speak if he thinks it looks helpful and can't find someone to read it for him on site.

(Then he'd probably go to actual doctors or healers for help.)