Hi, there is data about every troop, but it is fairly hard to digest and present in a simple way. Would players care about the average loot? all the options available? not sure 
There are some categories of monsters that have the same loot set, and others like the Tree Giants have specific ones; they do guarantee a Key and a Hammer, for example.
Big Dragon is in the Superboss loot category, so he gives the same loot as Kaiju and Rainmaker.
Ice Golem is in the Boss category, with the Mega Knight, Mech Robot and a few others.