Q--Is the tongue part of a creature's head?
A--My step-by-step reasoning: A creature's tongue is inside its mouth. A creature's mouth is part of its head.
So, the answer is yes.

Q--Does Neville Longbottom have more courage as a child than as an adult?
A--My step-by-step reasoning: Neville Longbottom is a character from the Harry Potter series. In the first few books of the Harry Potter series, Neville is a child. In the final few books of the Harry Potter series Neville is becoming an adult. Neville's first appearances in the series show him to be very cowardly. Neville is considered a hero by the end of the series.
So, the answer is no.

Q--Would a human following a hyena diet be unwelcome at a vegan festival?
A--My step-by-step reasoning: A hyena is a carnivorous mammal that feeds on the flesh of other animals. Vegans are people that stick to a strict diet that does not include animals or animal products.
So, the answer is yes.

Q--Are some chiropractic manipulations dangerous?
A--
My step-by-step reasoning: Manipulations of the neck can lead to complications such as stroke or paralysis. Manipulation of the lower back can lead to herniated disks.
So, the answer is yes.