Hostile blocks is a addon that adds 4 hostile mobs to your world that look like blocks.  The textures include dirt, cobblestone, planks, and concrete(white).  As this is only a beta release, they do not spawn naturally in the world unfortunately, but they can be spawned by a summon command and from a spawn egg in the creative inventory.

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https://www.youtube.com/channel/UCduvSG2FiFH-sg7QGWUi0Aw  

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Dirt (/summon block:dirt or find Spawn Dirt egg in creative inventory)

Drops: Dirt, and sometimes sticks, wheat seeds or other

Attack Damage: varies

Health: I think 10 I forgot lol.

Cobblestone (/summon block:cobblestone or find Spawn Cobblestone egg in creative inventory)

Drops: Cobblestone and sometimes vines, stone or coal

Attack Damage: varies

Heath: About 15

(There appears to be a glitch with the bottom, but it is fine when its on the ground.)

Planks (/summon block:planks or find Spawn Planks egg in creative inventory)

Drops: Planks and sometimes sticks, logs or leaves

Attack Damage: varies

Heath: About 15

Concrete (/summon block:concrete or find Spawn Concrete egg in creative inventory)

Drops: Concrete and sometimes sand, gravel or concrete powder

Attack Damage: varies

Heath: About 20

Note:

If you would like to use this in a map, plz link the page! Thanks!