Person who sings like someone in the Swiss Alps

• Swiss singer, perhaps
• Alpine noisemaker
• Old-time country singer, sometimes
• Alpine soloist
• One calling at peak times?
• Alpine warbler
• The lonely goatherd, in a "Sound of Music" song
• Alpine vocalist
• Producer of high and outside pitches?

Wiktionary Word definitions in Wiktionary
n. One who sings so that their voice fluctuates rapidly between their normal chest voice and a falsetto, one who yodels.