Not being able to get a spot at the trough is a local expression from Thirty Mile Camp. For example, a group of chicks or ducklings, or a litter of piglets, all eating from the same stone trough: the strong ones will dominate the best spots, eating and taking more. The weaker ones get pushed to the side, only able to eat whatever is left over after the others have finished. It's quite an illustrative bit of local language and it's used about people too, without the slightest negative connotation.
"The other two, give those to Xiao Tanzhi," suggested Lian Manman. Aside from the Abbot, there were other monks in the temple, all older than Xiao Tanzhi. The pancakes that had just been sent to the Abbot were likely something Xiao Tanzhi wouldn't get a taste of.
"Alright," agreed Lady Zhang, calling out to Xiao Qi, "Xiao Qi, go call Xiao Tanzhi over."
Xiao Qi answered and ran into the temple; shortly after, he returned with Xiao Tanzhi.