minecraft:blocks/attached_melon_stem

{
    "type": "minecraft:block",
    "pools": [
        {
            "bonus_rolls": 0,
            "entries": [
                {
                    "type": "minecraft:item",
                    "functions": [
                        {
                            "add": false,
                            "count": {
                                "type": "minecraft:binomial",
                                "n": 3,
                                "p": 0.53333336
                            },
                            "function": "minecraft:set_count"
                        }
                    ],
                    "name": "minecraft:melon_seeds"
                }
            ],
            "functions": [
                {
                    "function": "minecraft:explosion_decay"
                }
            ],
            "rolls": 1
        }
    ],
    "random_sequence": "minecraft:blocks/attached_melon_stem"
}