No, Tom Thumb and Safeway are the same store, with different regional names. Kroger and King Soopers are likewise the same store.
I see. The connection I was thinking of to Kroegers (we don't have them around here) is the Fred Meyer chain (I was reminded by a comment upthread). Fred Meyer was an Oregon based outfit until Kroegers bought it after the death of it's namesake. Of the supermarket chains in this area they are usually the highest priced, so I seldom shop there anymore.