Both of those declarations look weird to me. In Haskell it would be:

a :: Stringbob :: (String, Int, Double) -> [String]bob (a, b, c) = ...

… except that makes bob a function taking a tuple and it’s much more idiomatic to curry it instead:

bob :: String -> Int -> Double -> [String]bob a b c = ...-- syntactic sugar for:-- bob = \a -> \b -> \c -> ...

The [T] syntax also has a prefix form [] T, so [String] could also be written [] String.

OCaml makes the opposite choice. In OCaml, a list of strings would be written string list, and a set of lists of strings would be string list set, a list of lists of integers int list list, etc.