Written by Australian speech pathologists, Fronting Stuff is a book for Speech Pathologists which targets the process of Fronting.
It is a great program for k and g sounds that includes all positions and levels. It works through four levels and has worksheets for each:
Fronting Stuff has a k chapter and a g chapter. It also provides pictures for all positions in words.
Designed to be quick and easy to use, Fronting Stuff has 100 + pages of worksheets. Pages can also be used to take home for homework.