roly-poly
US /ˈroʊliˌpoʊli/
UK /ˈroʊliˌpoʊli/

1.
tatu-bolinha, bicho-de-conta
a small, round, woodlouse-like crustacean that can roll itself into a ball when disturbed
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My daughter loves to watch the roly-polies curl up when she touches them.
Minha filha adora ver os tatus-bolinha se enrolarem quando ela os toca.
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We found a tiny roly-poly under the rock.
Encontramos um pequeno tatu-bolinha debaixo da rocha.