This is literally just a frog plushy named Jarl, the price of this item is 10 GP and there is a 50% chance the shop keeper will sell it to you for free and a 5% chance the shop keeper will give you 10 GP to take it. If someone rubs Jarl's belly (bonus action), they are then attuned to Jarl and Jarl will say "I'm Jarl, Jarl Wants tummy rubs", and repeat it for 1 hour or until someone gives Jarl a tummy rub for 20 minutes straight. If someone tries to get rid of Jarl without giving him to a new victim... er.. I mean owner, Jarl will always find his way back to them somehow. Every time someone rubs Jarl's belly, there is a 0.01% chance Jarl pukes out a slobbery +5 weapon of the DM's choice, after this trait is used it can't be used again for 500 years. 

Notes: giving Jarl a tummy rub, Creation, Healing, Summoning, Teleportation, Damage, Control, Communication, Buff, Social, Debuff, Scrying, Detection, Banishment, Movement, Negation, Utility, Exploration, Combat, Shapechanging, Deception, Foreknowledge, Warding, Container, Consumable, Cursed, Footwear, Belt, Necklace, Jewelry, Wristwear, Headwear, Outerwear, Eyewear, Handwear, Bane, Instrument, Sentient, Tag, Tags, Eldritch Machine, Focus, Negates Difficult Terrain, Artificer, Bard, Subclass Feature, Warm, evocation, divination, transmutation, enchantment, Symbiotic, Vestige of Divergence, Seal of Drakkenheim, Relics of Saint Vitruvio, Wilderkith, Soulbinders, Hallowed Dark, Abominations, Black Iron Pack, Grave Order, Amethyst Knife, illusion seed, Memory Philter, fabled, beekeeper's commitment, magical meal, socketable, Utility Potion, Combat Potion, Whimsical Potion, BagOfHolding2025