Cornimer

Cornimer is a tortoise that appears in the. He only comes out during the Acorn Festival in, and gives you mushroom furniture, walls, and floors in change for acorns, which are obtained by looking under oak trees during the festival. However, if the player gives him a rotten acorn, he will say that all the other acorns the player gave him that time don't count. Much like Tortimer telling the player's fortune by using fireworks he can tell the player's fortune by using acorns, as shown below. He gives the player pieces of the mushroom series, each time wanting more acorns.

Theory
Although some people think he is Tortimer in disguise, and others think he is a relative or a friend, the strange thing is that during the Acorn Festival you cannot see Tortimer behind the desk in the Town Hall. Also, when you first talk to him, he accidentally uses the phrase, "sprout" which is Tortimer's phrase instead of lil' oakie, his own phrase. Another piece of evidence that Cornimer is possibly Tortimer is that when the first time Cornimer laughs in his dialogue towards the player he says "Hef Horf Horf... Wait no! Good luck lil' Oakie!" He even says, " I'm Cornimer and I'm all mysterious and stuff." Another piece of evidence is that his face has a spike dropping down and when you talk to him he does a sneaky move like the Tortimer. The only difference in appearence between Tortimer and Cornimer is their heads. They both have the same shell, cane, and bow tie. Their names even sound similar. Another factor towards this theory is that Tortimer loves to prank the villagers and the player (like on April 1 of Animal Crossing he gives the player an unusable video game). Also sometimes in a mere friendly conversation with a villager near the festival they often claim that they have seen "the zipper" although there is only an acorn on his head.

Super Smash Bros. Brawl
In Super Smash Bros. Brawl, Cornimer is an obtainable sticker.

Cornimer