British English: An American football?

[Sitifan]

A football in British English is a soccer ball in American English.

An egg-shaped ball used in American football is called a football in American English, isn't it?

What is the British English for the egg-shaped ball used in American football?
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Thank you very much for your reply.

[Mister Micawber]

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From the Oxford English Dictionary:

football

• noun 1 any of a number of forms of team game involving kicking a ball, in particular (in the UK) soccer or (in the US) American football. 2 a large inflated ball used in such a game.
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Native English teacher at Mister Micawber's