Glossary entry (derived from question below)
English term or phrase:
chamshell
Portuguese translation:
em forma de concha
English term
Portugal
Tradução, Revisão e Edição
Native in: Portuguese (Variant: European/Portugal) 
Works in: English to Portuguese, German to Portuguese, Portuguese
chamshell
Proposed translations
Will do!
Native in: Portuguese (Variant: European/Portugal) 
Works in: English to Portuguese, French to Portuguese, German to Portuguese, and 1 more.
arredondada, em forma de concha
Arredondada e em forma de concha.
(Penso que há que incluir ambos os termos.)
Brazil
Eng. PhD. EN PT.BR ABRATES Accredited
Native in: Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Portuguese to English
concha/caçamba
Portuguese to English, English to Portug
Native in: English
Works in: Portuguese to English, English to Portuguese
capô frontal integral
Brazil
Translator EN-PTBR | Software Engineer
Native in: Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Portuguese to English
capô com painel único
https://www.landrover.com.br/land-rover-experience/news/range-rover-history.html
https://www.car.blog.br/2021/03/hyundai-apresenta-genesis-x-concept.html
Brazil
32 years engineering/law/contracts
Native in: English (Variant: US) , Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Portuguese to English
Capô abaulado/convexo
Portugal
Translator and Terminologist
Native in: Portuguese
Works in: English to Portuguese, French to Portuguese, Spanish to Portuguese
capot/capô articulado
https://www.vwvortex.com/threads/which-new-cars-have-clamshe...
A manutenção diária é facilitada pelo amplo capot articulado do motor, que permite o acesso a todos os principais componentes e pontos de serviço.
http://prewww.aecops.pt/pls/daecops3/pnews.build_page?text=1...
clamshell n as adj (can open and close like a clamshell) articulado adj
https://www.wordreference.com/enpt/clamshell
https://dicionario.priberam.org/capô
Discussion
In automotive design, a clamshell bonnet or clamshell hood is a design where the engine cover also incorporates all or part of one of the wings (fenders).