Looks like a partial cecal poo mixed with normal poo. Cecal droppings are usually foul smelling and come from the 2 cecal pouches in the intestines where contents are fermenting. They appear more shiny and slimey and resemble pudding. Here is an article explaining it: https://www.communitychickens.com/how-your-chickens-cecal-pouches-affect-its-droppings/