There are Literary Techniques in these quotes. But.. What exactly are they?

Question

" ... and he clenched a set of teeth so ragged and white and crowded, so jumbled together and overlapping, that it seemed he had chewed them up and was preparing to spit them out." (Metaphor?)

"They were tickled to death to hire her." (Metaphor?)

" "Just to gab, I'll say, chew the fat ..." " (Metaphor?)

"She was attacked by a sudden sputter of laughter." (Personification?)

Answer 1

hmm, that top one,  hesitant to just tag it as a metaphor as it is a vivid description using groups of adjectives.

I may be way off but  it reminds me of  a part in Macbeth

"what are these to withered and wild in their attire, they look not like inhabitants of the earth and yet are on it."   which has more alliteration than your quotation.

Hyperbole - tickled to 'death'

idiom/expression - to "chew the fat"

Onomatepia? 'sputter' allows you to hear the nature of the laughter

Answer 2

alliteration in the last one (sudden sputter). the others i am unsure besides metaphor.  

Answer 3

1) diction, metaphor

2) hyperbole

3) you could argue that this is style or voice

4) personification, alliteration

Note: a metaphor involves a comparison