Tangle
It's a not particularly complimentary Scottish term for an Englishman.
The British Isles generally refers to the island of Britain, and its large neighbouring island Ireland, and all of the smaller islands around the two of them. Although the term is not accepted in Ireland
It's Irish or Scottish, meaning "I don't."
British Isles is the geographical term for the islands of Britain and Ireland and all of their offshore islands. It has nothing to do with the political split of these islands.
The slang term spelled besties can mean best friends.The form "beasties" is a stereotypically Scottish term for creatures or monsters.
The term Scottish is ambiguous. It could mean the dialect of English spoken in Scotland (think Robert Burns) or the Scottish Gaelic (Celtic) language. If the latter is intended the question should be phrased 'How do you say infant in Scottish Gaelic'.
The British Isles used to be a geographical term referring to the Islands of Britain and Ireland. It is no longer used as the correct geographical term is now Britain and Ireland.
It means 'little'. Someone scottish could say something like: 'Och, look at this wee dog!' (oh look at this little dog!)
skelp
bairn
"Dorty" is a slang term used in Scottish English to describe something that is dirty or messy.