If you want to consider tinkle a noun, the plural is tinkles. There is no apostrophe of course.
Yes, "tinkle tinkle tinkle" is an example of alliteration, as it involves the repetition of the "t" sound at the beginning of each word.
There is no plural form. Do and Do not are verbs
The plural form of him, her, or it is them. (objective pronouns)
Bridges is the plural form of bridge.
The plural form of "is" is "are."
The plural form of "was" is "were."
The plural form of "I" is "we."
Tinkle Pit was created in 1993.
Tinkle Pit happened in 1993.
The plural form of mouth is mouths. The plural form of month is months. The Mounth is a range of hills in Scotland and does not have a plural form.
"Groceries" is the plural form of "grocery."
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.