Jemma’s new animal

‘How do I spell “Squink”?’ asked Jemma. 

‘It’s not in the dictionary

‘I know,’ said Mandy. ‘ Write “spuare” and “pink”. Cross out “are” in “square” and “p” in “pink”. Write the other letters together. That’s “squink”.’

I can understand what she means, but I don’t know how do you say “squink”.
At the first, she’s going to make a mouse in her  favorite books.
Why does she make “squink”?
That’s funny.
 R.Rita, W.Glllian, (1998), Jemma’s new animal, Oxford University Press.