Depending on the circumstances, browser cache or especially any local backup can sometime provide the means of getting GIFs from deleted Tumblr blogs if the content had been viewed prior the deletion. Temp files or cache folders where web site data is temporarily downloaded and stored include cached files from which you can recover the GIFs by searching your cache. Furthermore, if you have ever used a web or media downloader in order to save posts from Tumblr, chances are high that you have the GIFs already on your device. This method is a bit less accurate but if you looked at the blog lately, it is worth a try to use it.
More information: https://guideet.com/how-to-see-gif-packs-for-deleted-blogs-tumblr/
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