They are comedians. Mr. Bear is making jokes about Mr. Wolf's big body

Bear: "Hmm?　What's up, Humpty Dumpty?"

Wolf: "Huh ......! I'm not Humpty Dumpty!"

Bear: "I mean, you've got a little smaller Wolfie inside of you, right, that body?"

Wolf: "H, hey...! Don't touch my belly so much!"

Bear: "Hmm? Your belly is seamless."

Wolf: "No, that's not possible! If you're going to use me as an analogy, not Humpty Dumpty, Matryoshka, aren't you? No, I'm not the outermost one of Matryoshka!"

Bear: "Is that so? I thought if you peeled off more and more shells, you'd come out skinny at the end."

Wolf: "I, it ain't coming out unfortunately! There ain't nobody in this belly! It's all filled with fat!"

Bear: "I see. That's too bad."

Wolf: "Hey, ...... If you were touching it, you'd know that much! Don't make me tell you, it would be embarrassing!"