The term 'TABBY's Mate' is a reference to the popular children's book, 'The Cat in the Hat, ' which features a cat named TABBY and her mate, Tom. The crossword solutions for this term are TOM (3 letters) and TOMCAT (6 letters). Tom is a mischievous cat who often gets into trouble with his friend, TABBY. Together, they cause chaos and mayhem in the home of the two children they visit. TOMCAT is the name given to male cats, and it is also the name of the character Tom in the book.