Can bailiffs seize a Nintendo Switch console, it’s controllers and games?

Yes

Bailiffs may take control of goods only if they are goods of the debtor.^[1]

If the debtor is under 16, the bailiff may not take control of any goods.^[2][3]

If the bailiff takes control of goods that do not belong to the debtor named on the warrant, the owner may make a third-party claim.^[4][5]

If a bailiff threatens to take a games console, the threat is usually idle because selling video games consoles on the second hand market do not reach sufficient funds to pay the debt, let alone pay the enforcement fees. The threat is to inflict sufficient pain on the debtor to pay the money, because bailiffs know games consoles are close to the debtor.

^{[1] Paragraph 10 of Schedule 12 of the Tribunals, Courts and Enforcement Act 2007
[2] Regulation 2 of the Taking Control of Goods Regulations 2013
[3] Regulation 10 of the Taking Control of Goods Regulations 2013
[4] Civil Procedure Rule 85.4
[5] See Making a Third-Party claim to controlled goods}