Hi @kklo
I’m creating an ecommerce, where Suppliers register their products
I believe you are looking to create a Multi-Vendor Marketplace. This post will be useful to you for sure: https://woocommerce.com/posts/create-multivendor-marketplace-wordpress/
any dashboard plugin for the Supplier on the frontend or something similar to avoid contact with the backend
Based on your requirement you may want to look at Product Vendors that is an official extension at the WooCommerce.com marketplace. It allows multiple vendors to sell via your site and you can take a commission on sales. You will find its documentation here: https://woocommerce.com/document/product-vendors/
For any pre-sales questions related to this plugin, you can create a ticket here. You’d need to log into your WooCommerce account before you can access that page, or create an account if you do not have one. From there, click on the tab “I have a question about a specific extension or theme I’d like to purchase.” Over there we will be able to give you more details about that extension or recommend a different one, in case that doesn’t fit the goal you intend to achieve.
Just so you know, in the WooCommerce.com marketplace we offer a 30-day refund policy so you can test the extension and make sure it works for you.