My last question has not been resolved.
Can I store ERC20 coins (polygon) in trezor and not in metamask or myetherwallet
yes, every ERC-20 token can be stored using Trezor.
Now I can see the balance of USDT ERC20 (polygon) on my metamask wallet connected via trezor, how can I transfer this balance to the trezor Suite wallet?
If it is on Polygon network, then it is not ERC20 token.
Only ERC20 tokens (Ethereum network) will be displayed in Trezor Suite.
The tokens are already in your wallet (derived from Trezor Private key), it is just matter of interface that you use in order to access them (manage operations with them).