Yes. Using physical force to coerce or restrain a child who is not posing a threat to anybody is abuse.
https://fountainofyouthbath.com/can-a-person-be-forced-to-taie-a-shower/
"Potential Consequences of Forcing Hygiene":
Increased anxiety or distress in the individual.
Potential for trauma, particularly if the person feels violated or disrespected.
Damaged relationships, as the individual may feel resentment towards those enforcing the action.
Community backlash if the enforcement is viewed as abusive or overly controlling.
Forcing someone into a shower may lead to slips and falls, especially in vulnerable populations.
Potential for the individual to develop aversions to hygiene practices due to negative associations.