Hey there,
Your question states: If a child says
for "keep", this is an example of which type of process?
Answer/Reason: Your correct and final answer would be "fronting". This is a disorder in the child. It can be common at times. The result is a developmental phonological disorder. NOT all the times this would be common in each child, bu as a child repeatedly does this act, he can have this disorder.
~Jurgen