This tutorial contains a detailed pattern of crochet little Octopus.

When using similar materials, the toy will be about 3.5” (8-9 cm)

You can crochet a toy from any yarn, only you will need to change eyes pattern (or use plastic eyes) and will have to choose the size of hooks yourself

*This octopus differs from a Plush octopus only in the size of its eyes (https://dailydoll.shop/shop/plush-octopus-amigurumi-crochet-pattern/)