Mm, hybrid poetical forms. The limeronnet: 7 couplets, alternately long and short limerick metre, with the long couplets all using the same rhyme. The sonnaiku: 14 syllables in 4 lines with ABBA rhyme. The limerestina: a cycle of five limericks plus a final couplet following rules too complicated to work out. The villanellerick, the Petrarchan tercet, the epic cinquain, ...
But writing quite large in [Rosie] Hmmm. I read Marc's line as While skiing one day in Zermatt (which I think puts the correct stress in the place name), not While skiing one day in Zermatt. I agree you need a pretty strong (perhaps American?) accent to rhyme it with 'pot', though.