No, they're stored elsewhere - on my InkPad Color 3 they are in /ebrmain/share/fonts.
The "system" folder you see is only a part of the entire PocketBook, on my InkPad it is /mnt/ext1/system.
This is the list of files in /ebrmain/share/fonts:
- DejaVuSans-Bold.ttf
- DejaVuSans-BoldOblique.ttf
- DejaVuSans-Oblique.ttf
- DejaVuSans.ttf
- DejaVuSerif-Bold.ttf
- DejaVuSerif-BoldItalic.ttf
- DejaVuSerif-Italic.ttf
- DejaVuSerif.ttf
- DroidSans.ttf
- FreeSerif.ttf
- FreeSerifBold.ttf
- FreeSerifBoldItalic.ttf
- FreeSerifItalic.ttf
- LiberationMono-Bold.ttf
- LiberationMono-BoldItalic.ttf
- LiberationMono-Italic.ttf
- LiberationMono.ttf
- LiberationSans-Bold.ttf
- LiberationSans-BoldItalic.ttf
- LiberationSans-Italic.ttf
- LiberationSans.ttf
- LiberationSerif-Bold.ttf
- LiberationSerif-BoldItalic.ttf
- LiberationSerif-Italic.ttf
- LiberationSerif.ttf
- NotoSansArabicUI-Bold.ttf
- NotoSansArabicUI-Medium.ttf
- NotoSansArabicUI-Regular.ttf
- NotoSansArabicUI-Thin.ttf
- NotoSansArmenian-Bold.ttf
- NotoSansArmenian-Medium.ttf
- NotoSansArmenian-Regular.ttf
- NotoSansArmenian-Thin.ttf
- NotoSansCJK-Regular.ttc
- NotoSansDevanagari-Bold.ttf
- NotoSansDevanagari-Medium.ttf
- NotoSansDevanagari-Regular.ttf
- NotoSansDevanagari-Thin.ttf
- NotoSansGeorgian-Bold.ttf
- NotoSansGeorgian-Medium.ttf
- NotoSansGeorgian-Regular.ttf
- NotoSansGeorgian-Thin.ttf
- NotoSansHebrew-Bold.ttf
- NotoSansHebrew-Medium.ttf
- NotoSansHebrew-Regular.ttf
- NotoSansHebrew-Thin.ttf
- NotoSansSymbols-Bold.ttf
- NotoSansSymbols-Medium.ttf
- NotoSansSymbols-Regular.ttf
- NotoSansSymbols-Thin.ttf
- NotoSerifArmenian-Bold.ttf
- NotoSerifArmenian-Medium.ttf
- NotoSerifArmenian-Regular.ttf
- NotoSerifArmenian-Thin.ttf
- NotoSerifCJK-Regular.ttc
- NotoSerifDevanagari-Bold.ttf
- NotoSerifDevanagari-Medium.ttf
- NotoSerifDevanagari-Regular.ttf
- NotoSerifDevanagari-Thin.ttf
- NotoSerifGeorgian-Bold.ttf
- NotoSerifGeorgian-Medium.ttf
- NotoSerifGeorgian-Regular.ttf
- NotoSerifGeorgian-Thin.ttf
- NotoSerifHebrew-Bold.ttf
- NotoSerifHebrew-Medium.ttf
- NotoSerifHebrew-Regular.ttf
- NotoSerifHebrew-Thin.ttf
- OpenDyslexic-Bold-Italic.otf
- OpenDyslexic-Bold.otf
- OpenDyslexic-Italic.otf
- OpenDyslexic-Regular.otf
- PTSans-Bold.ttf
- PTSans-BoldItalic.ttf
- PTSans-Italic.ttf
- PTSans.ttf
- PTSansCaption.ttf
- PTSerif-Bold.ttf
- PTSerif-BoldItalic.ttf
- PTSerif-Italic.ttf
- PTSerif.ttf
- RKRaghuHindi.ttf
- Roboto-Black.ttf
- Roboto-BlackItalic.ttf
- Roboto-Bold.ttf
- Roboto-BoldItalic.ttf
- Roboto-Italic.ttf
- Roboto-Light.ttf
- Roboto-LightItalic.ttf
- Roboto-Medium.ttf
- Roboto-MediumItalic.ttf
- Roboto-Regular.ttf
- Roboto-Thin.ttf
- Roboto-ThinItalic.ttf
- fireflysung.ttf