The instrument "tammorra" isn't listed in the instrument tree (http://musicbrainz.org/instruments).
The "tammorra" has a description at https://www.wikidata.org/wiki/Q3980641 and is listed as a child of the "frame drum" (https://musicbrainz.org/instrument/f7d3dd06-721b-4258-8c5e-cf3b5085b45c - see https://en.wikipedia.org/wiki/Frame_drum), but maybe a child of the tambourine family (https://musicbrainz.org/instrument/4431f7b0-69a4-49ee-b84f-15dda19fb70c).

It is listed on the releases "Ethnosphere" by "Agricantus" (https://musicbrainz.org/release-group/6c4dccf8-d5ec-3846-8cf1-a4ff19e635e8 - see "Tonj Acquaviva" in the picture n. 6 at https://www.discogs.com/release/2020473-Ethnosphere/images).

Some links:

• https://books.google.it/books?id=DniXmlvb-6YC&pg=PA548&lpg=PA548 (useful informations)
• http://www.ernestodeangelis.net/CostrZTAMMORRA.html (how to build a tammorra)
• http://win.portalesila.it/musicaetnica/page1.html (short history)
• http://web.tiscali.it/musicastoria/Gli%20strumenti%20tradizionali.htm (tammorra ≠ tambourine)
• http://www.luca-rossi.com/tammorra-solo.html (a musician)
• http://theartofdefacing.altervista.org/ (... music)
• https://www.youtube.com/results?search_query=tammorra (tammorra music)
• http://www.etnofonie.it/tamb3.html (instruments in the same family)
• http://www.prolococervinara.it/tammorra/