Know your Japanese Mythological Beasts (part 1)

Question 1

What has the head of a monkey, the body of a tanuki, the legs of a tiger, and the tail of a snake?

Hint #1: Eating it is thought to cure the hiccups (I wonder what it tastes like and how it is prepared. I imagine it would make a decent miso-based nabe...).

Hint #2: Miyamoto Musashi supposedly killed one of these with a lance.
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Question 2

This mythical creature is native to mountain passes in Kumamoto. What is it?

Hint #1: They have a potato-like head (or a stone one), and a straw covered body.

Hint #2: Monks who stole oil are said to have been punished by being transformed into one of these.

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Question 3

This monster is a humanoid with blackish-green skin, luminescent eyes, and a pointed beard. It is rarely seen by man because it lives in an underwater kingdom.

Hint #1: Combine the kanji for "shark" and "person" to make this.

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Question 4

What is the Japanese Will 'o the Wisp?

Hint #1: A possible explanation for these phenomena is methane gas rising from the graves of decomposing corpses.

Hint #2: Combine the kanji for "ball" and "person".

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Question 5

What mythological creature resembles a snake, can speak to humans (but often lies), enjoys alcoholic beverages, can leap 1 meter, and has never been captured in spite of many reported sightings?

Hint #1: It appeared in Doraemon, where it was reported to be about 60cm in length.

Hint #2: The kanji for earth and child are used to write its name.

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