TL;DR: Please just say the word "call."
I suspect different house rules might apply here, but in my experience, these are general rules. YMMV. Also, I'm basing this answer on the TDA rules, which is a common but not universal set of rules.
It's acceptable to just put in a single chip to represent a call. If that chip represents more than the bet amount, that's still a call according to TDA rule 45:
45: Oversized Chip Betting
When facing a bet or blind, pushing out a single oversized chip is a call if raise isn’t first declared.
If that single chip represents less than the amount of the bet before you, then that's an undercall and represents a binding full call in most cases. According to rule 39:
39: Binding Declarations / Undercalls in Turn
A: General verbal declarations in turn (such as “Call” or “Raise”) commit a player to the full current action. See Illustration Addendum
B: A player undercalls by declaring or pushing out less than the call amount without first declaring “call”. An undercall is a mandatory full call if made in turn facing 1) any bet heads-up or 2) the opening bet on any round multi-way. In other situations, TD’s discretion applies.
I guess you're opening yourself up to some gray area in the undercall situation, but the ambiguity seems more to protect you as a potential caller when you might have misinterpreted the amount of a raise in front of you.
Either way, please just say the word "call." It makes life simpler for everyone and keeps the game moving. Nobody likes it when one player tries to live in the gray area where the dealer and others have to continually wonder about the action.