Ribbit from Piccadilly Software was advertised in Softalk Jul 1982.

The unmodified game title.

000464  00 FF FF C2 D2 CF CB C5 CE A0 C2 D9 A0 D3 D5 D0  ...BROKEN BY SUP
000474  C5 D2 A0 D0 C9 D2 C1 D4 C5 D3 A0 CF C6 A0 CD C9  ER PIRATES OF MI
000484  CE CE C5 C1 D0 CF CC C9 D3 A0 A0 00 00 FF FF 00  NNEAPOLIS  .....