https://scratch.mit.edu/faq says that screenshots of Scratch might be used under the CC BY-SA 2.0 Generic license. This does not apply to trademarked assets.
This image or video file represents content which has appeared on the Scratch programming language website (https://scratch.mit.edu/). According to the terms of use in sections 4 to 5 for that website, all content added and support materials are available under the terms of the Creative Commons Attribution-ShareAlike 2.0 Generic license, with the exception of third-party copyrighted materials that was not made by the user and Scratch trademarks (including the Scratch Cat and Gobo characters). This image is being used in accordance with those terms of use on Wikimedia Commons.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
This screenshot either does not contain copyright-eligible parts or visuals of copyrighted software, or the author has released it under a free license (which should be indicated beneath this notice), and as such follows the licensing guidelines for screenshots of Wikimedia Commons. You may use it freely according to its particular license.
Free software license:
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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This software is provided by Massachusetts Institute of Technology "as is" and any express or implied warranties, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose are disclaimed. In no event shall Massachusetts Institute of Technology be liable for any direct, indirect, incidental, special, exemplary, or consequential damages (including, but not limited to, procurement of substitute goods or services; loss of use, data, or profits; or business interruption) however caused and on any theory of liability, whether in contract, strict liability, or tort (including negligence or otherwise) arising in any way out of the use of this software, even if advised of the possibility of such damage.
Note: if the screenshot shows any work that is not a direct result of the program code itself, such as a text or graphics that are not part of the program, the license for that work must be indicated separately.
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Uploaded a work by Screenshot is own work, Scratch is by MIT and other contributors from Screenshotted from https://scratch.mit.edu/projects/editor, with default sprite being swapped with another sprite in the asset library. with UploadWizard