The Zombie Horse Spawn Egg is a unique item that, when used, instantly summons a Zombie Horse, an undead variant of the regular horse. This creature is not available through natural means within the normal gameplay and can only be accessed via inventory editing or with the use of commands. It exhibits a greenish-blue hue, with a skeletal appearance, and, like other undead mobs, is immune to poison and regeneration effects.
This item has no numerical item ID, therefore you must use the item ID to spawn the item. Numerical item IDs were removed in Minecraft version 1.13.
The item id for Zombie Horse Spawn Egg is minecraft:zombie_horse_spawn_egg
The item ID for Zombie Horse Spawn Egg is minecraft:zombie_horse_spawn_egg
This is the spawn command to give yourself Zombie Horse Spawn Egg in Minecraft which includes the Minecraft /give command. If you are using the Essentials plugin you will need to use /minecraft:give instead of /give