"Thumbling and "Thumbling's Travels" (also known as "Thumbling as Journeyman") are two German fairy tales collected by the Brothers Grimm. They are tales number 37 and 45 in the collection and are related to the English Tom Thumb, whose title the Grimms' stories often share when translated into English.
The two stories do not feature the same character. The original German names for the two characters are "Daumsdick" (Literally, "Thumb-thick") for the former, and "Daumerling" for the latter.
It is Aarne-Thompson type 700, Tom Thumb.
In the first story, "Thumbling", a poor childless peasant couple wishes for a child "no matter how small" aloud. Seven months later the wife has a small child "no longer than a thumb" which they call "Thumbling" and who becomes a "wise and nimble creature." Thumbling as he grows wishes to help his father in the chores so one day asks if he can lead their horse to where his father is working by sitting in the horse's ear and giving it directions. As Thumbling performs this chore, two strange men notice the horse being led by a loud voice, and when they find out the voice belongs to a person sitting in the horse's ear, ask the peasant if they can buy Thumbling to "make a fortune" in exhibiting the little man. Thumbling convinces the peasant to take the money and leaves with the men by sitting on the brim of one of the men's hats. Then after a while Thumbling tricks the men into letting him down and he goes to hide in a mouse hole.
Later in the night Thumbling tries to sleep in a snail shell but is awakened by the sound of robbers plotting to rob a pastor's house. Thumbling yells out to them to take him along and he will help them rob it, by going into the house and handing things out to them. The robbers agree to carry him to the pastor and Thumbling makes a whole lot of noise in the house pretending to help the robbers steal. Thumbling wakes people up by yelling things like "What do you want? Do you want everything...?" making the robbery very obvious. A maid wakes up and scares off the robbers but does not see Thumbling. Thumbling gets a good night sleep in the hay. However, in the morning the maid feeds the hay that he was sleeping in to the cow. Thumbling begins to yell from the cow's stomach but the pastor thinks that an "evil spirit" had entered the cow, and has it killed. The cow's stomach is thrown into a dung heap, and before Thumbling climbs all the way out of the stomach, a wolf eats it. Thumbling, now inside of the wolf's stomach, persuades the wolf to take him home to his parents' on pretense of eating everything there. His parents kill the wolf to get Thumbling out and promise never to sell him again, not for "all the riches in the world." They give him food, drink and new clothes.