The word squid is usually used as singular or plural, examples: Singular: A squid was caught on my line. Plural: The restaurant had a tank of live squid on display. That being said, some people do squids as the plural form.
If you mean the ocean animal, then the plural is squid. Although squids is probably acceptable and only an absolute pedant (like me) will tell you it's wrong. If you mean a superconducting quantum interference device (SQUID) then the plural is SQUIDS.
The plural form for the demonstrative pronoun this is these.
octopuses is the plural word octopus that is known so far in the UK and US.===================================================Octopuses (or occasionally octopodes). Although it is often supposed that octopi is the 'correct' plural of octopus, and it has been in use for longer than the usual Anglicized plural octopuses, it in fact originates as an error. Octopus is not a simple Latin word of the second declension, but a Latinized form of the Greek word oktopous, and its 'correct' plural would logically be octopodes.
The plural form of the word "inferno" is "infernos."
The plural form of the word "ranch" is "ranches."
There is no plural form for the word, countries. This word itself is a plural.
The plural form is data.
There is no plural word for if.
The plural form of the word "baby" is "babies."
The plural form of vow is vows.
The plural form of the word "pharynx" is "pharynges."