WebP to MNG converter
For permanent links you can use: https://ezgif.com/webp-to-mng?url=https://example.com/source-image.gif
Online WebP to MNG image converter
Upload and convert animated WebP to MNG, quickly and completely free.
MNG is a variation of animated PNG image format, it never gained widespread adoption, but it is still used for some game engines and probably some other software.
MNG files are not supported by web browsers, so you will not see the preview of the output image, but you can save the resulting file anyway and use this tool if you need to convert WebP animation to MNG for some game or other software with MNG support.