It used to be "catalogue". However, "catalog" has become an acceptable alternative.
Catalogs
catalogs
Catalog
The plural way to spell studio is studios.
The plural is cantaloupes.
The plural is roses.
Cataloges
catalogs
Catalog
The plural way to spell studio is studios.
The plural is "emeralds."
The plural is bridges.
The plural is resources.
The plural is cherries.
The plural is hooves.
The plural is cantaloupes.
The plural is roses.
No, "catalogs" is not singular possessive. Singular possessive would be "catalog's" with an apostrophe before the "s" at the end.