No.  MonoTouch and Mono for Android do not support XAML or XAML-based UI abstraction or translation layer.  Nor do they attempt to expose any kind of a lowest-common-denominator, write-once/run-anywhere solution for user interfaces.  Instead, each product exposes the APIs and UI paradigms of their underlying platform.  

On MonoTouch, you have full access to the iOS APIs, and MonoDevelop integrates to Xcode to enable you to use the native interface layout tools included in their tools.

On Mono for Android, the standard Android layout XML format is supported, so you can use any of the tools that generate this XML (such as DroidDraw) to layout your UI.