From the Super Mario Wiki
The Dinosaurs are a group of people inhabiting Diamond City; they most commonly appear to antagonize Mona in the various WarioWare games and are the proprietors of the Pizza Dinosaur restaurant chain. Half the jingle of Mona Pizza is sung by the Dinosaurs, who boast about how great they are and that they prefer quantity over quality in their pizzas.
In WarioWare: Twisted!, the Dinosaurs, after receiving a call from someone who mistakenly believed them to be Mona Pizza, become enraged and attack Mona in large robotic monsters. The Dinosaurs' mechs are stopped by Mona's animal friends, who destroy their machines.
Later, in WarioWare: Touched!, the Dinosaurs return to aid Mona's rival, Vanessa, in stopping Mona from performing at the Hawt House, while in WarioWare: Smooth Moves, the Dinosaurs make a minor appearance as an American football team (named Team Dinosaur) during Mona's segment of the game.
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