This is a typo, isn't it?

shouldn’t it just be: 言ってくればいいのに ?

くれる → くれれ+ば
する → すれ+ば
出す → 出せ+ば

It’s just the way that conjugates.

https://bunpro.jp/grammar_points/154

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thanks! That still feels like an awkward conjugation to me tho idk

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Just keep in mind that for this form, there is no distinction between ichidan and godan verbs. They both conjugate the same way. 飲む, a godan verb becomes 飲めば, and 食べる, an ichidan verb, becomes 食べれば. It’s the same way for both types.

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