ActuallyAdditions/src/generated/resources/assets/actuallyadditions/models/item/worm.json

{
  "parent": "minecraft:item/handheld",
  "textures": {
    "layer0": "actuallyadditions:item/worm"
  },
  "overrides": [
    {
      "predicate": {
        "actuallyadditions:snail": 1.0
      },
      "model": "actuallyadditions:item/snail"
    }
  ]
}