minecraft-assets/assets/minecraft/models/item/lashing_potato.json

{
  "parent" : "item/handheld",
  "textures" : {
    "layer0" : "item/lashing_potato"
  },
  "overrides" : [
    {
      "predicate" : {
        "lashing_potato_extended" : 1
      },
      "model" : "item/lashing_potato_extended"
    }
  ]
}