Huh... I find it interesting how Chomper, in contrary to everyone else, has quite the delighted look on his face.
Is a certain purple Rexling looking forward to a little snack now?
lol, what's funny is that's exactly what Cera asks him in the actual scene

Now for the caption...
Cera: "Why didn't Ducky and Ruby invite me to their girls day out?"
Chomper: "Aw, cheer up."
Petrie: ""Yeah, me not a girl but me wish Petrie could be with them."
Spike (thinking): "Not me!"
Littlefoot: "Well, regardless, can you two tell us what you're doing down there, at least?"