Looks like Tom from Tom and Jerry is battling against Jerry while he transforms into a giant mouse. But it's "Hippety Hopper" from Looney Tunes which is baby kangaroo. Let's the slapstick fight begins.

Tom from Tom and Jerry and Hippety Hopper belongs to Warner Bros., Warner Bros. Discovery (Formerly WarnerMedia), HBO, Universal Studios Asia / Mexico / Australia Distributions, Cartoon Network and SDS Studio Distribution Services