Is adobe stocks included in school account plans?

Adobe stock can be included in certain school plans. If you have a school plan, you should contact your plan administrator and that person should contact the vendor for getting the available options.

A stock plan is not included in an individual subscription for students and teachers. That is the same plan as a commercial individual subscription at a discounted price. There is no indivuîdual student or teachers plan for stock, so the price is the same for us all.

BTW: depending on your school plan, you may even be restricted for accessing the free collection, as some school plans are restricted because of the children's age. There is no exception done for teachers as of my knowledge.

You can however access the free collection with an individual Adobe ID, or may be also by switching to the personal part of your school account. If you have an individual plan, you can disregard this, however.

I don't think that Adobe Stock is included in the Creative Cloud All Apps subscription offered to students and educators. Stock subscription options are shown here:

https://stock.adobe.com/plans

Additionally, there are >1.1 million images in the Adobe Stock Free Collection that requires no subscription,

I would think that there might be a program that is provided as an option to schools for students but not something that is included.  I'm sure other software companies do the same. I guess it depends on the type of needs of the school as well.