closest thing to a baseball bat in this game for melee?

[Djej Funny]

^

[57E]

Masseter is the first thing that comes to mind, but maybe somebody else knows a better example https://warframe.fandom.com/wiki/Masseter

[Gamedoc]

There aren't many generic weapon designs. Maybe a Kronsh/Rabvee zaw?

["Twas'G'lorious"]

grahms fighting stance kinda reminds me of swinging a bat until the roundy rounds begin.

[tv]

most of the large hammers will knock and enemy out of the park, figuratively and literally. Whats more satisfying than shattering overguard and then knocking an eximus off the map in the Circuit?

[The Big Brzezinski]

Probably a hammer with a Renok skin.

https://warframe.fandom.com/wiki/Renok_Hammer_Skin

[Dimension]

ehhhhhh