Squids are marine animals, and since they travel together like fish, they are probably called a "school" when they are together, as in, "a school of squids."
It's interesting that so many different names are used for groups of different wildlife. For more information, please see the related links, below.
starfish
The collective name for a group of sailors are called a crew
When squid gather in a group, they usually exhibit "shoaling" behavior, which is similar to "schooling" except not uni-directional. So you can call them "a shoal of squid".But obviously a squad of squid would be more fun. So use that instead. Since collective nouns are an informal part of language, if enough people use it, it becomes the standard.
There is no collective name for a group of platypuses. Platypuses are solitary animals and do not live or move in groups.
The collective name is a bed of clams.
The collective name for badger is 'sett'
There is no standard collective noun for colossal squid. There is little known about this creature, even the fact that they may form groups.The colossal squid must mate to reproduce so the appropriate collective noun may be a pair of colossal squid.
The name is a collacine
The collective noun is a company of firemen (firefighters).
gear
A group of spies is called a "Nest"
A group of spies is called a "Nest"