Ways to fetch ATA account in typescript?

I have the following code that works fine with PDAs.

const escrow_pda = PublicKey.findProgramAddressSync([Buffer.from("escrow"), fundraiser.publicKey.toBytes()], program.programId)[0];const esc = await program.account.campaignEscrow.fetch(escrow_pda);

However, when I use the same fetch method on the following ATA, it returns Error: Invalid account discriminator

const vault_ata = (await getOrCreateAssociatedTokenAccount(provider.connection, fundraiser, mint_token, escrow_pda, true)).address    const esc = await program.account.campaignEscrow.fetch(vault_ata);

What methods do you use to fetch data from the associated token account in typescript ?

EDIT:

How can I also get the token balance in Rust ?

//TokenAccountpub donor_ata: Account<'info, TokenAccount>,