I'm going to ambush my 4 PCs (level 4 each) when they're crossing a river. 3 Lizardfolk (CR 1/2 each) and 1 Lizardfolk Shaman (CR 2) will be chilling underwater. According to the encounter calculator, it's a Hard (1,500xp) encounter. Lizardfolk Shaman have Conjure Animals and so he'll bust out 4x Crocodiles (1/2 CR each). Shouldn't that change the difficulty? Or is that covered by the Lizardfolk Shaman's CR? Would the crocodiles give xp if killed?