Dia dhaoibh ar maidin,
I've managed to get hold of another bilingual story book in Irish and English published by Mantra Lingua. This one is called 'Listen, Listen' - which I was expecting to see translated as Éist, Éist but in fact the title in Irish is Cogar, Cogar. In my (small) Collins dictionary that means - Whisper, Whisper or am I missing out on another use of this verb?
Here's a taste of it -
Cogar, cogar.....cén torann é sin? Feithidí ag canadh mórthimpeall.
Listen, listen.....what's that sound? Insects singing all around!

Bícearnach, bícearnach, crónán, crónán, seabhrán, seabhrán.
Chirp, chirp, churr, churr, buzz, buzz, whirr,whirr.
(The translation is by Siobhán Ní Loingsigh)

"Cogar" means "whisper", and may be also used to say "tell me", but not to say "listen", as far as I know... I don't know why they have translated "Listen" by "cogar". "Listen" is "éist" in Irish, as you know...

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

Perhaps they avoided "éist, éist" because it would sound like "shoosh, shoosh", i.e., "be silent", "shutup", in the context.

Cogar means "whisper" but also "listen" in Connemara the sense of the interjection "hey", "say", or "tell me", so I am not surprised to see it there instead of éist.

Both, in the end, mean "be quiet for a second and listen".

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).