Which witch is which?

Selfish shellfish.

How can a clam cram in a clean cream can?

Don’t eat with your mouth full!

Yellow butter, purple jelly, red jam, black bread.

Chester Cheetah

If you must cross a course cross cow across a crowded cow crossing, cross the cross coarse cow across the crowded cow crossing carefully.

How much ground would a groundhog hog if a groundhog could hog ground? A groundhog would hog all the ground he could hog if a groundhog could hog ground.