Hello, I have some NBT-Data from mobs for you.

How to summon not movable mobs?

/summon ? ~ ~ ~ {NoAI:1b}

For example: /summon minecraft:skeleton ~ ~1 ~ {NoAI:1b}
In old Versions you should type(for example): /summon Skeleton ~ ~1 ~ {NoAI:1b}

How to summon entities with custom health?

/summon
minecraft:armor_stand ~ ~1 ~
{Attributes:[{Name:generic.maxHealth,Base:100}],Health:100}
In old Versions:



/summon
Skeleton ~ ~1 ~
{Attributes:[{Name:generic.maxHealth,Base:100}],Health:100}